Components of Projectile Motion

AI Thread Summary
A ball is thrown from a 19m building, landing 98.2m away, with gravity at 9.8 m/s². The initial velocity and the x and y components just before impact need to be calculated. The time of flight was determined to be approximately 1.97 seconds. The discussion emphasizes the need to consider both x and y components separately and eliminate time from the equations. The user successfully solved the problem but expressed difficulty in marking the thread as solved.
Londoncalling
Messages
11
Reaction score
0
1. The problem

A ball is thrown from a 19m building and hits the ground 98.2 m away. Gravity = 9.8 m/s2. Find the intial velocity as well as x and y components of the ball just before it hits the ground

Homework Equations


I found time=1.969149822.
 
Last edited:
Physics news on Phys.org
Welcome to PF!

Londoncalling said:
A ball is thrown from a 19m building and hits the ground 98.2 m away. Gravity = 9.8 m/s2. Find the intial velocity as well as x and y components of the ball just before it hits the ground
…
I found time=1.969149822.

Hi Londoncalling! Welcome to PF! :wink:

No, you've assumed the initial velocity is horizontal.

Call the initial speed v, at an angle θ to the horizontal.

Then do the equations for the x and y directions (separately), and eliminate t. :smile:
 
Thanks I figured it out! Now if only I could figure out how to mark this thread as solved...
 
Londoncalling said:
Thanks I figured it out! Now if only I could figure out how to mark this thread as solved...

oh, that facility stopped working ages ago! :rolleyes: :smile: :-p
 

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 »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Projectile Motion Experiment: Results Too High?
Replies
2
Views
2K
Find the height of a lamp based on the velocities of projectiles
Replies
40
Views
2K
Circular motion to projectile motion
Replies
18
Views
2K
Projectile Motion Graph Analysis
Replies
1
Views
2K
Is the y-component of projectile motion acceleration equal to gravity?
Replies
8
Views
2K
Find the Height of a Building by dropping a ball from the top
Replies
7
Views
3K
A ball is thrown w/initial speed vi at an angle 𝜃i with the horizontal
Replies
5
Views
1K
Find Projectile Flight Time Given Only Maximum Height
Replies
4
Views
2K
A plane, diving with constant speed at an angle of 53.0 degrees....
Replies
2
Views
3K
Projectile Motion Experimental Error
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top