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Potential Energy of an Object at a Height

How many kilo...

Question

How many kilograms will a man working at the power of 100 W, be able to lift at constant speed of $1 m s^{- 1}$ vertically ?

A

10 k g

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B

50 k g

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C

15 k g

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D

100 k g

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Solution

The correct option is A $10 k g$
power $=$ workdone per unit time
work done $= F o r c e \times d i s p l a c e m e n t$
so,P $= F v, P \propto v$ ,here v $= 1 m s - 1$
or, P $= m g v$
or, 100 $= m \times 10 \times 1$
m $= 10 k g$

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