Question

A girl of mass 35 kg climbs up from the first floor of a building at a height of 4 m above the ground to the third floor at a height of 12 m above the ground. What will be the increase in her potential energy? (g = 10 ms).

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Answer 1

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• Gravitational potential energy at Ist floor =mgh =35×10×4=1400J
• Potential energy at third floor =mgh =35×10×12=4200J
• Increase in potential energy =4200−1400

=2800J

Answer 2

Answer : Gravitational potential energy at Ist floor =mgh =35×10×4=1400J

Potential energy at third floor =mgh =35×10×12=4200J

Increase in potential energy =4200−1400

=2800J

Hope it helps