Q.

If angular momentum is conserved then 

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a

rotational kinetic energy must be conserved

b

angular velocity must be constant.

c

linear momentum must be constant

d

net external toque acting on the system must be zero

answer is B.

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Detailed Solution

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External torque τext=dLdt= rate of change of angular momentum if τext=zero then L must be conserved. 

 

 

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