A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

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5 J

350 J

100 J

3430 J

answer is D.

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Detailed Solution

Total mass = (50 + 20) = 70 kgTotal height = 20 × 0.25 = 5m∴ Work done = mgh = 70 × 9.8 × 5 = 3430 J

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