A 0.16 kg billiard ball moving at 1.20 m/s collides elastically with one of the same mass at rest. It continues at a speed of 0.60 m/s afterward in a different direction from before. What is the final speed of the other billiard ball?

I know the answer is 1.0 m/s, I just don't know how to work out the problem to show my work.

Question

A 0.16 kg billiard ball moving at 1.20 m/s collides elastically with one of the same mass at rest. It continues at a speed of 0.60 m/s afterward in a different direction from before. What is the final speed of the other billiard ball?

I know the answer is 1.0 m/s, I just don't know how to work out the problem to show my work.

irishboy123 · Answer

hi @eturpin1

"elastically".  

compare KE before and after collision.  

the answer is not exactly 1, but it can be rounded to that.