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Question
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
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Solution
Mass of water, m = 50 kg
Gravitational force F = mg = (50 × 10) N
Height, h = 15 m
Gravitational potential energy = mgh
= 50 × 10 × 15
= 7500 J
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