A particle of mass m is moving in a circular path of constant radius r such that its tangential acceleration varies with time as at=k2rt2
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Since ac=k2rt2
v2r=k2rt2
v2=k2r2t2
v=krt
F=mdvdt
=mkr
Power =F.v
=(mkr)×(krt)
=mk2r2t
Hence b is the correct answer.
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