Question

A girl of mass 35 kg climbs up from the first floor of a building at a height 4m above the ground to the third floor at a height 12m above the ground. What will be the increase in her gravitational potential energy ? (g = 10 ms-2).

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Answer 1

Explanation:

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Gravitational potential energy at 1st floor = mgh1

35 × 10 × 4 = 1400 J

Potential energy at third floor = mgh2

35 × 10 × 12 = 4200 J

Increase in potential energy = 4200 – 1400 = 2800 Joule.

Answer 2

Explanation:

Gravitational potential energy at 1st floor = mgh1 = 35 × 10 × 4 = 1400 J

Potential energy at third floor = mgh2 = 35 × 10 × 12 = 4200 J

Increase in potential energy = 4200 – 1400 = 2800 Joule.