Question

Two objects of masses 100g and 200 g are moving along the same line and direction with velocities 2 metre per second and 1 metre per second respectively. They collide and after the collision the second object moves with velocity 1.67 metre per second determine the velocity of the first object.

Answer 1

Since no external force acts on them, the net change in momentum is zero Initial momentum Final Momentum (100 x 2) + (200 x 1)= (100 x 1.67)+ (200 x V)= V 1.165 m/s Hence the second object moves with 1.165 m/s in the same direction