Lesson: Chapter 18 — Work, Energy and Power

18.2. Potential energy 4 of 8 Reset answers

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Question 4

Find the gravitational potential energy of an object of mass 7.5 kg at a height of 4 m. (g = 10 m s^-2)

A 3000 J B 300 J C 75 J D 30 J

The right answer is the one marked above.

300 J. E_p = m g h = 7.5 kg × 10 m s^-2 × 4 m = 300 J.

All three quantities are already in the units the formula wants, so this one is a straight multiplication with nothing to convert.

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