When an object breaks into two pieces (explosion, radio-active decay, recoil, etc.), the lighter fragment gets more kinetic energy than the heavier one. This is a consequence of momentum conservation, but can you also explain it by using Newton’s laws of motion?
Solution to 22DQ Step 1 Consider an object of M broken into two pieces of masses m and m respectively moving in 1 2 opposite directions with a velocity v and V respectively. Now according to Newton’s third law of motion, F =-F =F , since there is no external force acting on the system. 1 2