$A$ particle of mass $m$ moves along a circular path of radius $r$ with a time-dependent centripetal acceleration $a_c = k^2rt^2$,where $k$ is a constant. What is the power delivered to the particle by the force acting on it?
- A$2m k^2 r^2 t$
- B$m k^2 r^2 t^2$
- C$m k^2 r^2 t$
- D$m k^2 r t^2$
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