Question

Abbey and Mia are in the basement playing pool. On Abbey's recent shot, the cue ball was moving east at 82 cm/s when it struck the slower 5-ball moving in the same direction at 24 cm/s. The 5-ball immediately speeds up to 52 cm/s. Determine the post-collision speed of the cue ball in cm/s.

Answer 1

$m_1=m_2,$

$v_1+v_2=u_1+u_2,$

$u_1=v_1+v_2-u_2=54~\frac{cm}s .$