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AP® Physics C: Mechanics

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Average Power in Lifting with Constant Acceleration

APPHMC-ELYU1A

A motorized pulley lifts an object of mass $m$ from rest with a constant acceleration $a = g$.

The average power delivered in time $t$ assuming that there are no frictional forces is

A

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

B

$mg^2t$

C

$2mg^2t$

D

$ 4mg^2t $

E

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