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A man weighing 80 kg climbs a staircase ...

A man weighing `80 kg` climbs a staircase carrying a `20 kg` load. The staircase has `40` steps, each of `25 cm` height. If he takes `20` seconds to climb, the work done is

A

9800 J

B

490 J

C

`98 xx 10^(5) J`

D

7840 J

Text Solution

Verified by Experts

The correct Answer is:
A
`W = vec F.vec S = FS = (M + m)g(nxx h_("each step"))`
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Knowledge Check

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