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A 1,000-W motor powers a hoist used to lift cars at a service station.

(a) How much time would it take to raise a 2,100-kg car 2 m?

(b) If the original motor is replaced with one rated at 2,000 W, how long would it take to complete this task?
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Added Fri, 26 Jun '15
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(a) Power = Energy /time
=> Energy = mgh = 2100*9.8*2 = 41160 J
=> 1000 = 41160 /t
=> t = 41.16 second

(b) 2000 = 41160/t
=>t = 41.16/2 = 20.58 seconds
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Added Fri, 26 Jun '15
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