Center of Mass and Collision

A ball falling freely from a height of $ 4.9 \mathrm{~m} / \mathrm{s} $, hits a horizontal surface. If $ e=\frac{3}{4} $, then the ball will hit the surface, second time after.

A particle of mass m is projected with velocity v at an angle \(\theta\) with the horizontal. At its highest point, it explodes into two pieces of equal mass, one of the piece continue to move on the original trajectory, then the velocity o...