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Mass of a man is 60kg. He climbs up 20m ...

Mass of a man is 60kg. He climbs up 20m height with a bucket having water of mass 15kg. So, work done is ………… kJ. `(g=9.8ms^(-2))`

A

15

B

20

C

150

D

1.5

Text Solution

Verified by Experts

The correct Answer is:
A
Tota mass = mass of the person + mass of the bucket
`=60kg+15kg=75kg`
Work = `mgh`
`=(75)(9.8)(20)`
`=14,700J`
`~~15,000J`
`=15xx10^(3)J=15kJ`
Note : If g is taken as `g=10ms^(-2)`, then the answer would be exact `15,000J=15kJ`.
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