Lesson: Chapter 18 — Work, Energy and Power

18.2. Kinetic energy 3 of 7 Reset answers

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Question 3

Which equation gives the kinetic energy of an object?

A E_k = ½ m v² B E_k = m v C E_k = ½ m² v D E_k = m g h

The right answer is the one marked above.

E_k = ½ m v². The mass enters plainly and the velocity is squared, then the whole thing is halved.

m g h is the potential energy formula. Notice which quantity is squared in each: neither m nor h in m g h, and v alone in ½ m v².

Answer the question to continue.