What is the kinetic energy of a 10 kg body moving at 13 m/s?
Answer and explanation
Correct answer: A. 845 J
- Step 1: KE = ½mv². Step 2. KE = ½ × 10 × 13² = 845 J. Answer: 845 J. Why not the others: 1690 J is what you get if you forget the factor ½. 65 J is what you get if you forget to square the speed. 422.5 J is what you get if you halve twice.
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