Two men of equal masses stand at opposite ends of the diameter of a turntable disc of a certain mass, moving with constant angular velocity. The two men make their way to the middle of the turntable at equal rates. In doing so

Moderate

A

kinetic energy of rotation has increased while angular momentum remains the same.
B

kinetic energy of rotation has decreased while angular momentum remains same.
C

kinetic energy of rotation has decreased but angular momentum has increased.
D

both kinetic energy of rotation and angular momentum have decreased

Solution

$I_{1} ω_{1} = I_{2} ω_{2}$
Since, men move towards middle of turn table I₂ decreases hence $ω_{2}$ increases.
So kinetic energy increases and angular momentum remains constant.

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