Physics

Problem

A 1 kg ball moving at 12 m/sec. collides head on with 2 kg. ball moving in the opposite direction at 24 m/s. If the coefficient of restitution is

2/3

then how much energy is lost in collision- (1) 240 Joule (2) 120 Joule (3) 360 Joule (4) 400 Joule