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A block of mass $m$ is moving according to the equation $x(t) = at^2$.

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

A

$ \cfrac {ma^2t}{4} $

B

$ \cfrac {ma^2t}{2} $

C

$ ma^2t $

D

$ 2ma^2t $

E

$ 4ma^2t $

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