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A 910-kg object is released from rest at an altitude of 1200 km above the north pole of
the earth. If we ignore atmospheric friction, with what speed does the object strike the
surface of the earth?
(G= 6.67 * 10^-11 (N*m^2)/kg^2, M_earth = 5.97 * 10^24 kg, the polar radius of the Earth
is 6357 km)

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