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