Question

When two blocks connected by a stretched spring (as shown) start moving from rest towards each other under mutual interaction. Then (pickup the correct alternative or alternatives)

(A) their velocities are equal and opposite.

(B) their accelerations are equal and opposite.

(C) the force acting on them are equal and opposite.

(D) their momentum are equal and opposite

Answer 1

Correct option (C) (D)

Explanation:

The spring pulls both the blocks with same force. Hence force on both blocks is equal and opposite. since no net external force acts on system and its initial momentum is zero, therefore net momentum of system is always zero. Hence momentum of blocks are equal and opposite.