# Tennis ball impulse problem

1. Nov 15, 2005

### jacy

hi,
I am trying to solve this problem.

A tennis ball of mass m=0.060kg and speed v= 25m/s strikes a wall at a 45 degree angle and rebounds with the same speed at 45 degree. What is the impulse given to the ball?

Do i need to break velocity into its components. Please suggest me a hint, thanks.

2. Nov 15, 2005

### BerryBoy

Yes you do need to break velocity into components. If there is no friction (a sensible assuption in this case), would the rebound affect the vertical component of the velocity?

Hope this helps,
Sam

3. Nov 15, 2005

### amcavoy

Once you break it into components use the impulse-momentum theorem:

$$\int\mathbf{F}\,dt=m\mathbf{v}_f-m\mathbf{v}_i$$

4. Nov 15, 2005

### jacy

impulse

Thanks for replying. I wish i could draw the diagram. Is there a way that i can insert the diagram. Plz let me know