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8. (a) Calculate the potential energy of a 10.0-kg mass on the surface of the Earth...

8. (a) Calculate the potential energy of a 10.0-kg mass on the surface of the Earth and at an altitude of 400 km respectively; (b) calculate the speed needed to move this mass from surface of the Earth to the altitude of 400 km.   (-6.25*108 J, -5.88*108 J, 2.72*103 m/s)

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