Q

A water tank of mass 500 kg is placed on the roof of a building 20 m above the ground. The acceleration due to gravity is g = 10m/s . If the tank is moved to the roof of another building that is twice as high as the first building, while its mass remains unchanged, what will be its new gravitational potential energy?

RRB Group D 04 Aug, 2026 (9:00 AM - 10:30 AM) 2026
✓ Answer: C 200,000 J
Gravitational potential energy is mgh. At twice the original height, h = 40 m, so U = 500×10×40 = 200,000 J.
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