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When a running boy jumps on to a rotating table, the quantity that is conserved is

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Linear momentum

Kinetic energy

None of the above

Angular momentum

answer is B.

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Detailed Solution

Angular momentum is conserved when the net external torque acting on the system is zero.

When the boy jumps on the table, his angular momentum is added to the angular momentum of the table and the net external torque acting on the system is assumed to be zero.

So, the total angular momentum of the system (table and boy) remains constant.

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