Posted by **cassie** on Thursday, October 11, 2007 at 11:55pm.

newtons law of gravitation says that the magnitude F of the force exerted by a body of mass m on a bod of mass M is F=GmM/r^2 where G is the gravitational constant and r is the distance between the bodies.

a)find dF/dr and explain its meaning. What does te minue sign mean?

b)suppose it is known that the earth attracts an object with a force that decreases at a rate 2N/km when r=20,000km?

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