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Q.

A person of mass 50kg carrying a load of 20kg walks up a staircase. If the width and height of each step are 0.25m and 0.2m respectively, the work done by the man in walking up 20 steps is, (g = 10ms-2)

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a

2000J

b

8/00J

c

2800J

d

1400J

answer is D.

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Detailed Solution

W = mghvertical = (70) × 10 × 0.2 × 20
W = 2800J

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