What is the kinetic energy of a 5 kg body moving at 6 m/s?
Answer and explanation
Correct answer: A. 90 J
- Step 1: KE = ½mv². Step 2. KE = ½ × 5 × 6² = 90 J. Answer: 90 J. Why not the others: 180 J is what you get if you forget the factor ½. 15 J is what you get if you forget to square the speed. 45 J is what you get if you halve twice.
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