Finding the initial velocity of a thrown object caught at a certain height

AI Thread Summary
To determine the stopping distance of a car traveling at 35.1 m/s with an acceleration of -2 m/s², the equation vf² = Vi² + 2ad can be used, where vf is the final velocity (0 m/s), Vi is the initial velocity (35.1 m/s), and a is the acceleration (-2 m/s²). The calculated stopping distance is approximately 308 meters. Additionally, for the rocket problem, when thrown straight up at 12.42 m/s and caught 5 meters above the launch point, the final velocity can be determined using kinematic equations. The user expresses a need for clarification on the symbols and equations involved, indicating a desire to refresh their physics knowledge for an upcoming event. Overall, the discussion revolves around applying kinematic equations to solve motion-related problems.
Jake M
Messages
5
Reaction score
0
A car is traveling along a road at 35.1 meters/second(m/s). All of a sudden the navigator yells "Stop! The driver quickly applies the brakes at an acceleration of -2m/s/s (meters per second squared) and comes to a stop.

How much distance it take to stop the vehicle?

My question is what equations to use in solving this problem.
Thanks for any hep in advance.
 
Physics news on Phys.org
Givens:
Vi=35.1 m/s
Vf=0 m/s
a= -2 m/s/s
d= ?

THis is the formula you can use to solve for distance (d):
vf^2 = Vi^2 + 2ad
 
Hi there PM,
thanks for the info. It's been about 20years since I've had a physics problem to solve. This isn't home work or anything but rather practice for an up coming Rocketry event. Can you show me how to solve for this? The symbols have me abit confused. Also another word problem that came up was the following:
A man is standing at a launch site. The rocket doesn't liftoff. Frustrated s/he throws it straight up with a speed of 12.42 m/s. It is caught on the way down at a point 5.0 meters above where it was thrown, by a fellow rocketeer on the second floor, who doesn't want to see any harm come ot this wonderful rocket. The first man wants to figure out how fast the rocket was going when it was caught.
Again thanks for all your help, really rusty with this right now.
 
Sorry PM, For the first equation my answer was 308.00250000000005
Am I on the right track?
many thanks again,
Jake.
 
yes that looks correct to me.
 
A man is standing at a launch site. The rocket doesn't liftoff. Frustrated s/he throws it straight up with a speed of 12.42 m/s. It is caught on the way down at a point 5.0 meters above where it was thrown, by a fellow rocketeer on the second floor, who doesn't want to see any harm come ot this wonderful rocket. The first man wants to figure out how fast the rocket was going when it was caught.
Again thanks for all your help, really rusty with this right now.

Any help on this one?
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Initial Velocity Calculation Help: Find V0 from 9.8m & 4.7m/s/s
Replies
1
Views
1K
Question about finding height, given vi and time
Replies
13
Views
3K
Basic Kinematics Questions, first year physics
Replies
15
Views
6K
Motion in 1-D Problem: Tractor vs Tesla Collision Calculation
Replies
1
Views
1K
Car Crash Physics: Velocities & Energy Lost in Collision
Replies
1
Views
3K
Newtonian physics word problem static friction
Replies
15
Views
4K
Trying to find equations to use for calculation of initial speeds
Replies
3
Views
3K
Will the Tractor and Tesla Avoid a Collision on the Mountain Road?
3
Replies
100
Views
10K
How Does Reaction Time Impact Driving Distance and Safety?
Replies
5
Views
2K
How can the collision of connected particles be analyzed in mechanics?
Replies
7
Views
1K

Hot Threads

Recent Insights

Back
Top