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A boy suddenly comes and sits on a circular rotating table. What will remain conserved?

1. (a) Angular velocity
2. (b) Angular momentum
3. (c) Linear momentum
4. (d) Kinetic energy

Correct answer: (b) Angular momentum

Solution

When the boy sits on the rotating table, there is no external torque acting on the system. Hence, angular momentum is conserved. However, angular velocity, linear momentum, and kinetic energy may change.

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