11328(6.6710m /s kg)(20 kg)(10 kg)1.7100.60 miUKUK−−×⋅=+¡−×=−which yields K= 5.6 ×10−9J. Note that the value of ris the difference between 0.80 m and 0.20 m. 40. (a) The initial gravitational potential energy is
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