Question

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?

Answer 1

efficiency= KE at bottom / PE at top

Answer 2

50%

Answer 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.

Answer 4

thanks JC

Answer 5

.25 is right