What is the kinetic energy of a 5 kg body moving at 6 m/s?

Answer and explanation

Correct answer: A. 90 J

  1. Step 1: Kinetic energy is J. Answer: 90 J. Why not the others: 30 J: uses momentum. 180 J: forgets the factor 1/2. 15 J: forgets to square the speed.

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