# Tennis ball impulse problem

#### 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.

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#### 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

#### amcavoy

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

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

#### jacy

impulse

BerryBoy said:
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

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

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