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प्रश्न
A girl of mass 35 kg climbs from the first floor of a building at a height of 4 m above the ground to third floor at a height of 12 m above the ground. If 'g' is equal to 10 ms−2, the increase in gravitational potential energy of the girl is:
पर्याय
1400 J
2800 J
4600 J
4200 J
MCQ
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उत्तर
2800 J
Explanation:
The girl's height increases by 12 − 4 = 8 m.
The increase in gravitational potential energy is mgΔh = 35 × 10 × 8 = 2800 J.
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