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)

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their accelerations are in equal in magnitude and opposite in direction

their momentum are equal in magnitude and opposite in direction

their velocities are equal in magnitude and opposite in direction.

the force acting on them are equal in magnitude and opposite in direction

answer is C, D.

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Detailed Solution

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.

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