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

`9800J`

`490J`

`98X10^(5)J`

`7840J`

Text Solution

Verified by Experts

The correct Answer is:

`(1)`

` W =vec F. vecS = fs = (M + m)g(n xx h_(each step))`

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