The gravitational attraction between two objects with masses m_{1} and _{2},_{1}m_{2}/x^{2},*gravitational constant*.

How much work is done by gravity when the separation changes from x_{1} to _{2}? _{2}<x_{1}.

If one mass is much greater than the other, the larger mass
stays essentially at rest while the smaller mass moves toward
it. Suppose a ^{13} kg
^{30} kg sun at a speed of ^{4} G.^{8} ,^{7} ,^{-11} .

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