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A man of mass 50 kg climbs up a ladder of height 10 m. Calculate: (i) the work done by the man, (ii) the increase in his potential energy. (g = 9.8 m s-2) |
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Answer» Mass of man = 50kg Height of ladder, h2 = 10m (i) Work done by man = mgh2 = 50 × 9.8 × 10 = 4900J (ii) increase in his potential energy: Height,h2 = 10m Reference point is ground, h1 = 0m Gravitational potential energy = Mg (h2-h1) = 50 × 9.8 × (10-0) = 50 × 9.8 × 10 = 4900J |
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