Question

Prove the principle of conservation of linear momentum for two bodies moving along the same line

and colliding.​

Answer 1

Let us consider two bodies of masses m1 and m2 moving in straight line in the same direction with initial velocities u1 and u2. They collide for a short time ∆t. ... This means the total momentum before collision is equal to total momentum after collision. This proves the principle of co conservation of linear momentum.