Initial velocity Definition and 451 Threads

Homework Statement An arrow, starting from rest, leaves the bow with a speed of 27.5 m/s. If the average force exerted on the arrow by the bow was increased 3 times and the arrow was accelerated over the same distance, then with what speed would the arrow leave the bow? Homework Equations...

Homework Statement In this Lab you will toss water balloons over the edge of a raised sidewalk. The thrower should hold the balloon over the edge of the sidewalk and then toss it directly upward. As soon as the balloon is released the person on the ground should start the timer. Stop the...

Am I anywhere near correct? Homework Statement A ball is thrown and upward and reaches it's maximum height in 1.80 sec. A. Find Initial Velocity B. Find Max Height Reaced C. Find Velocity 1.15 sec after being thrown. Homework Equations The Attempt at a Solution A...

I if a body is thrown vertically upward (from ground), and it reaches back to ground in 10 seconds.. then the initial velocity can be calculated by Vf = Vo + gt.. where the final velocity Vf is equal to zero and the maximun height is given by s = Vot + 1/2g(t^2).. Is these correct?

Homework Statement Given a missile with 9500km range, what must its initial velocity be to travel that distance? Disregard issues introduced by the missile's boost phase, and state the velocity as km/h. (Presumably, the curvature of the planet is to be ignored, as well.) Homework...

I can't figure this one out! Please help! You are standing on the edge of a ravine that is 15 m wide. You notice a cave on the opposite wall whose ceiling is 7.9 m below your feet. The cave is 5.8 m deep and has a vertical back wall. You decide to kick a rock across the ravine into the cave...

ok i had to build a trebuchet for high school and i can't seem to get a decent value for the initial velocity please help. i used a 60 pound counter weight (27.2 kg) a tennis ball to launch (.057 kg) and the counter weight drops about 1.3 m when it is launched i used the equation mgh = 1/2 mv...

Homework Statement A bottle is thrown with an initial velocity of 4 m/s at 45 degree angle from the horizon. Find its final horizontal and vertical velocities before striking the ocean. Homework Equations change x= innitial velocity (t) + a(t squared) final velocity= innitial velocity...

I'm not sure how to find the initial velocity of a ball that is released from a height y and bounces through a distance x. The ball has an elasticity E and radius R but I don't know an equation that relates these and the number of bounces to the ball's initial velocity.

An Olympic long jumper leaves the ground at an angle of 18.3 ° and travels through the air for a horizontal distance of 8.86 m before landing. What is the takeoff speed of the jumper? I'm completely dumbfounded on this one. What I have done is cut the distance in half to create a triangle and...

A rolling ball has an initial velocity of -1.5 m/s . a. if the ball has constant acceleration of -0.23 m/s^2, what is its velocity after 2.2 s? V = vo + at = -1.5 -0.23 * 2.2 = -1.5 - 0.506 = -2.006 = -2.0 m/s answer is -2.0 m/s b. what was its average velocity during that time...

Homework Statement I have a general question. If you were to determine the intial velocity of an object shot vertically into the air, how could you use kinematics equations to predict the height and distance the object would reach if you were then later given a launch angle? Does this mean...

This seems a simple enough question, but I am not sure on how to go about solving it "What is the minimum positive initial velocity necessary for an object to be launched from ground level so that it reaches a height of 80 meters?" Multiple choice answers: a) 5m/s...

Ok So if I were to launch a waterballoon with a waterballoon launcher VERTICALLY , how could I find out the Initial Velocity With OUT a stop watch? My other supplies include a meter stick

initial velocity confusion! please help! hello all, i am slightly confused about initial velocity during free fall if a ball is being thrown in the air, and the velocity time graph shows 20m/s at 0 seconds, and -20m/s at 4 seconds, which is when the ball drops if i want to calculate the...

The question is as follows: A man stands at the edge of the roof of a building 20.0m above the ground.He throws a ball vertically straight upwards(it just misses the edge of the building as it falls back down).If the total time taken for the ball to travel from his hand to the ground is...

the question: Someone throws a ball horizontally from the top of a 25.0 m high cliff and the ball lands 45.0 m from the base of the cliff A) What was the initial velocity of the ball? B) What was its speed wen it hit the ground? I don't need complete work just a beginning please.

This is the problem: Let's ignore the second part, because I can't even get to there yet (sounds simple enough if I figured out the first part). What I am stuck on, is the fact I have no initial velocity or time. So I have two unknowns. Here is what I think I know. The acceleration is...

Problem: A ball is thrown vertically upward, which is the positive direction. A little while later it returns to its point of release. The ball is in the air for a total time of 10 s. Note: Near the Earth's surface, g is approximately 9.80 m /s2. (a1) What is the algebraic expression for...

hey, I’ve been wondering for quite sometime now that if I am given values for displacement, time, and final velocity if it were able to calculate the acceleration and the initial velocity? I have been trying to rearrange the formulas: v = u + at v^2 = u^2 + 2as s = ut + .5at^2 but...

ok, so i just had my exam 10 minutes ago and i can't think of anything else except this seemly easy problem that i couldn't get. a football is kicked on the horizontal plane (ie. y_0 = 0 ) at some angle alpha, it covers a horizontal displacement of 100 ft 2.5 seconds later, find the initial...

an object is connected to the wall through a spring and is resting at its equilibrium position. its mass is M and the coefficient of kinetic friction is 1/4. the object is flicked so that it will return to its original position (not instantly, but its oscillation is damped slowly). what is...

A particle is projected on a horizontal ground and moves freely under gravity. The horizontal and vertical components of the initial velocity are 2u and u ms^1 respectively. The ball lands a distance 80m from the point of projection. Show that u=14 This is what I did: Taking motion...

I'm in a high school AP physics class but I suspect this question is considerably above the course level because I don't think it was intended to be a part of the project, so I'm not sure which forum to put it in. I would like to find the initial velocity required to launch a ping pong ball 25...

a basketball player is 1.9m tall, wants to make a basket 10m away. the basket is 3.05m tall. gravity is 9.8, if he shoots from a height of 1.91m at 33.3 degree angle, what initial speed is thrown to make a basket? i have no clue how to find initial velocity when it isn't given.

a 11.9g bullet is fired vertically into a 5.49kg block of wood. the bullet gets stuck in the block, and the impact lifts the block 0.11m up. given g=9.8m/s^2. what was the initial velocity of the bullet? Pi=Pf is this right...

maximum height?? 1) A ball is thrown vertically upward and is caught by the thrower after 2.00s. find a) initial velocity b) the maximum height it reaches? a) initial velocity obviously = o, but i have no idea how to find max. height? 2) the driver of a 600kg sports car, heading directly...

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 50.0 m below its starting point at a time 5.00 s after it leaves the thrower's hand. Air resistance may be ignored. I tried a...

Calculating initial velocity for object... I will give the problem first and then explain what i am having trouble with. a.) With what speed must a ball be thrown directly upward so that it remains in the air for 12.6 seconds? b.) What will be its speed when it hits the ground? c.) How...

There is a question that is being a pain...Could sombody point me in the proper direction ..this is the question.. A golf ball is hit with an initial speed of 35m/s at an angle less the 45 degrees above the horizontal.(A)The horizontal velocity componentis (1) greater than,(2) equal to or (3)...

Hi all, A friend and myself have constructed a very basic potato cannon and we are now looking to find the initial velocity of the potato as it leaves the barrel. I was wondering if there is a formula with which we can calculate this speed. We have found that flight time is the only ‘easy’...

I have this physics problem that I have no clue how to approach... Here's the given info: A ball is launched at a 60 deg angle toward a target. The coordiantes of the origin is (0,0), and the coordinates of the target is (16,0). What would be the power required units/second to get the...

Hello everyone :smile: I know that \sqrt { \frac {2d} {g} } but what about including initial velocity? Thanks in advanced "Im the master of time" -- Eiffel 65

a) The acceleration of a spaceship is given by a(t) = 3 m/s2 – (2 m/s3 ) t. Find the initial velocity V0 so that the spaceship is at the same point where it started after 5 seconds. No idea how to do this one, but do you need to integrate? Ty

I'm supposed to use g=9.81 m/sec and my measured values of s and h to find the initial velocity of a ball shot out of a gun i did in lab today. I was wondering what equation i use to find the initial velocity.

Consider a particle with initial velocity v that has magnitude 12.0m/s and is directed 60.0 degrees above the negative x axis. 1.) What is the x component v_x of v(velocity)? Express your answer in meters per second. a.) v_x = ____ well i drew the picture where the negative x-axis...

Hey guys I am kinda new do this forum, but if anyone can help me one this IT would be great I have this homework problem I tryed many times but can't figure it out, Tiger Woods can routinely hit a gofl ball 350-yards(320m) assuming he hits at an angle that gives him maxium distance solve...

Can anyone tell me if my answers are right or wrong? thanks A boy with a slingshot wants to hit a can on top of a pole. The can is a distance of 15 meters from the boy at an elevation of 30 degrees above the horizontal. The boy aims the slingshot directly at the can and projects a stone with...

Hello i have been able to do 7 out of 8 question on my linear motion questions, but this last question number 8, is proving difficult. I don't know whether the tutor has made a mistake (as the answers are typed at the bottom) so if you could be of help i would be very glad ty. I am using s =...

need help finding where to start, "A freely falling object requires 1.50sec to travel the last 30.0m before it hits the ground. From what height above the ground did it fall?" I know that: accel = -9.80m/s^2 avg. veloc for last 1.50 sec = 20m/s that i need the initial velocity for...

A ball has an initial velocity of 10 m/s. The acceleration of gravity is 9.8 m/s^2. What will be it's postion after 2.12794 s if it is throw a) down with an initial velocity of 10 m/s? Answer in units of m. b) up with an initial velocity of 10 m/s? Answer in units of m. -- I...

It's been a while since I have gone through my physics classes so help me out if you would. While investigating a traffic accident we found skid marks that were 24.9 m in length. The mass of the car was around 1250 kg. After the accident reconstructionist used his "sled" the coefficient of...

i know this is a really simple problem but I'm kinda stuck on it since i don't know what to do with the equation I'm given :eek: ... Having won the game, a baseball pitcher hurls the ball up in the air. Its height in feet t seconds after the throw is given by h(t)=5.9+69t-16t^2 How high...

Hey everyone, I'm doing a lab for engineering class, and I'm having a little trouble with a part of it. The lab was that we have a cannon on a table, with 3 launch settings (different lengths the spring is compressed). The table is 40" high. Also, we have a dixie cup 90" away from the table...

if a disk which is initially spinning with an angular velocity,w, radians per second is pushed with an initial linear velocity of v, what is the resultant motion? assume a kinetic friction of mu normal to the disk i would love to see how this problem is solved. it seems real...

Does the Initial velocity required depend on the mass of projectile to impart a projectile of perticilar angle and perticular height?

Simple Determination of Initial Velocity of a Projectile It is possible to roughly determine the initial velocity of a projectile shot from a launcher like the one linked to below using a number of methods. http://www.science4schools.co.uk/acatalog/10-1365.jpg Two of which I am aware...

A 1.4 kg box slides 15m across the floor. The coefficient of kinetic friction between the box and the floor is 0.3. I found that friction force in slowing the box was -61.74J. Is this right? What was the initial velocity of the box? I worked this problem using Kf = Ki + Wnc and found...

Calc help please! Can someone please help me how to do this problem using calculus? Thanks a lot. A ball is dropped out of a window 19.6m above the ground. At the same time another ball is thrown straight down from a window 79.6m above the ground. If both balls reach the ground at the same...

Given: g = 9.8 m/s^2 A cannon sends a projectile towards a target a distance 1250m away. The initial velocity makes an angle 40 degrees with the horizontal. The target is hit. What is the magnitude of the initial velocity? How high is the highest point of the trajectory? How long does...