question_answer 26)

Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 m s-1  and 1 m s-1 respectively. They collide and after the collision, the first object moves at a velocity of 1.67 m s-1. Determine the velocity of second object.  

Answer:

Let the 100 g and 200 g objects be A and B as shown in diagram, Initial momentum of Initial momentum of Total momentum of A and B before collision Let the velocity of A after collision  Momentum of A after collision Also, momentum of B after collision Total momentum of A and B after collision Now, by the law of conservation of momentum, Momentum of A and B after collision = Momentum of A and B before collision .