3.3 Rate of change

Please solve problems (b). Thanks.

Newton's Law of Gravitation says that the magnitude F ofthe force exerted by a body of mass m on a body of massM is the following, whereG is the gravitationalconstant and r is the distance between the bodies.F=(GmM)/r^(2)

(a) Find dF/dr.
dF/dr =

(b) Suppose it is known that Earth attracts an object with a forcethat decreases at the rate of 2 N/km when r = 20000 km.How fast does this force changewhen r = 10000 km?
wrong check mark N/km


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