Lesson: Chapter 18 — Work, Energy and Power
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An object of mass 6 kg is moving with a velocity of 4 m s-1. What is its kinetic energy?
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48 J. Ek = ½ × 6 × 42 = ½ × 6 × 16 = 48 J.
12 J is what you get by forgetting to square the velocity. Square first, then multiply by the mass, then halve.
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