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A block of mass $m$ is moving according to the equation $x(t) = bt^3 $.

What is the instantaneous power delivered at time $t$?

A

$ 3mb^2t^3 $

B

$ \cfrac {9mb^2t^3}{2} $

C

$ 6mb^2t^3 $

D

$ 9mb^2t^3 $

E

$ 18mb^2t^3 $

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