ch13-p040 - 40. (a) The initial gravitational potential...

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11 3 2 8 (6.67 10 m /s kg)(20 kg)(10 kg) 1.7 10 0.60 m i UK U K ×⋅ =+ ¡ −× =− which yields K = 5.6 × 10 9 J. Note that the value of r is the difference between 0.80 m and 0.20 m. 40. (a) The initial gravitational potential energy is
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