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A rod of mass m is hinged at its end. It is released and hits a block of mass $m$ kept on the ground elastically. To calculate the velocity of the block just after the collision, we use

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conservation of angular momentum

low of conservation of momentum

equation for coefficient of restitution

conservation of energy

answer is B, C, D.

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Detailed Solution

Momentum is not conserved as hinge exerts a force.

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