Question

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:

Options

• 1400 J

• 2800 J

• 4600 J

• 4200 J

Answer 1

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.