A body of mass m kg lifted by a man to a...

A body of mass `m kg` lifted by a man to a height of one metre in `30 sec` . Another mass lifted the same mass to the same height in `60 sec` . The work done by then are them are in the ratio.

A

`1:2`

B

`1:1`

C

`2:1`

D

`4:1`

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The correct Answer is:

B

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