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>> $A rigid body of mass m kg is lifted unif$

Question

A rigid body of mass $m$ kg is lifted uniformly by a man to a height of one metre in $30$ sec. Another man lifts the same mass to the same height in $60$ sec. The work done on the body against gravitation in both the cases are in ratio:

A

1 : 2

B

1 : 1

C

2 : 1

D

4 : 1

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Solution

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Correct option is B)

$W = F . S$
As work done is independent of time. So, both the man does same work.
Hence, the work done on the body against gravitation are in ratio $1 : 1$ .

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