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## Homework Statement

What is the average power developed by a motor

as it lifts a 400.-kilogram mass at constant speed

through a vertical distance of 10.0 meters in

8.0 seconds?

(1) 320 W (3) 4,900 W

(2) 500 W (4) 32,000 W

## Homework Equations

P=Wd/t= Fd/t= mad/t

## The Attempt at a Solution

How does the fact that acceleration is 0 change the way I should approach this question. The question says acceleration is constant.

On the other hand I tried using this formula.... P=Fv..... but because I dont know acceleration, I can't find 'F'.