# Physics Conservation of Matter Question

1. Apr 9, 2009

### TigerLilly

1. The problem statement, all variables and given/known data

Here is the set-up:
-there is a lab bench that is a certain height above the floor, "H"
-on the bench is a ramp that is a certain height above the bench top, "h"
-a ball is dropped on the ramp and then is "launched" in the air and eventually falls to bounch on the ground. How can I calculate the distance from the bench where the ball bounces first?

I have "h" and "H".

2. Relevant equations

To calculate the speed of the ball I did:

Eg=Ek
mgh=(1/2)mv^2

I'm unsure how to proceed from here to find the distance. I don't have the mass of the ball, the acceleration or any angle for the ramp.

Other possible equations I could use are:
W = ∆ K Ek
W = F d cos θ

3. The attempt at a solution

I know I have to take into account that there are 2 forces acting on the ball. The first is the horizontal force propelling the ball forward and the force of gravity pulling on the ball.

I was thinking of finding Ek and Eg again and add them together for Et to use in the work formula. But I don't have the mass of the ball.

I'm just unsure what to do from here.

2. Apr 9, 2009

### aimslin22

From what I understand, you don't need the m of the ball because:

mgh=1/2mv^2

therefore gh=1/2v^2

3. Apr 9, 2009

### aimslin22

I think you have to break it up into components (x and y)

Sorry if this doesn't help

4. Apr 9, 2009

### TigerLilly

No it did actually. I was working on it with a friend and it helped a lot. I figured it out now. Thanks so much!