When two blocks connected by a spring move towards each other under mutual interaction

Options

A. their velocities are equal and opposite.
B. their accelerations are unequal and opposite
C. the force acting on them are equal and opposite
D. their momentum are equal and opposite

Answer

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 moment is zero, therefore net momentum of system is always zero, hence momentum of blocks are equal and opposite.