A boy on a swing is pulled to a position 2.34 m off the ground and released. At the fastest and lowest point of the swing the boy is 0.50 m off the ground and travelling 3 m/s. The percent efficiency of this swing system is?

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3. 👁 1,005
1. efficiency= KE at bottom / PE at top

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2. 50%

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3. I promise to you the answer is 25% I got this answer correct on my exam. I am too lazy to type an explanation. Good luck. Trust ong.

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4. thanks JC

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