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If angular momentum is conserved then

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rotational kinetic energy must be conserved

angular velocity must be constant.

linear momentum must be constant

net external toque acting on the system must be zero

answer is B.

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Detailed Solution

$External torque τ_{ext} = \frac{dL}{dt} = rate of change of angular momentum if τ_{ext} = zero then L must be conserved .$

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