Q.

Assertion (A) : If there is no external torque on a body about its centre of mass, then the velocity of centre of mass remains constant.
Reason (R) : The linear momentum of an isolated system remains constant. 

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a

A is incorrect, R is correct

b

Both A & R are correct. R is correct explanation of A 

c

A is correct, R is incorrect

d

Both A and R are correct, but R is not correct explanation of A

answer is D.

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Detailed Solution

In the absence of external torque angular momentum is conserved.

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