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?

Question

anonymous · Answer

I hope I can finish this question quickly!  I have to go to work soon.

ybarrap · Answer

This is a completely elastic collision, so by the conservation of momentum:

$$
m_1v_1=mv_1=m_1v_1'+m_2v_2'=m(v_1'+v_2')\
v_2'=v_1-v_1'\
=1.2-0.60
$$

anonymous · Answer

So it's just 0.60 m/s?

ybarrap · Answer

yes

anonymous · Answer

You are amazing :D haha! Thank you so much for helping me today!!

ybarrap · Answer

you're welcome!