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A particle of mass m is moving in a circ...

A particle of mass `m` is moving in a circular path of constant radius `r`, such that its centripetal force `F_r` varies with time `t` as `F_r=K^2rt^2`, where k is a constant. What is the power delivered to the particle by the forces acting on it?

A

`mk^(2)t^(2)r`

B

`mk^(2)r^(2)t^(2)`

C

`m^(2)k^(2)t^(2)r^(2)`

D

`mk^(2)r^(2)t`

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