Q.

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…..joule

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a

9800

b

490

c

98×105

d

7840

answer is A.

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Detailed Solution

work done w= mgh = (80+20) ×9.8×40×0.25= 9800 joule
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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…..joule