Question: 2 points ) In this problem, use the fact that the force of gravity on a particle of mass mm at the point with position

2 points) In this problem, use the fact that the force of gravity on a particle of mass mm at the point with position vector rr is
F=GMmrr3F=GMmrr3
where GG is a constant and MM is the mass of the earth. Calculate the work done by the force of gravity on a particle of mass mm as it moves radially from 7500 km to 9000 km from the center of the earth.

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