# Newton's Law of Gravitation

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• November 20th 2012, 12:04 AM
cherryblossom289
Re: Newton's Law of Gravitation
Do you go to MCC? Is this from Madeline's worksheet? I am stuck on this too!
• November 20th 2012, 01:19 AM
MarkFL
Re: Newton's Law of Gravitation
Do you follow what has been posted so far? If not I will be glad to try to explain.
• November 20th 2012, 08:32 AM
skeeter
Re: Newton's Law of Gravitation
In this case, I believe the magnitude of F given should be differentiated w/r to r ...

$F = \frac{k}{r^2}$

$\frac{dF}{dr} = -\frac{2k}{r^3}$ where $\frac{dF}{dr}$ is a rate of change of force magnitude in $\frac{N}{m}$ and can be determined from the given info.

... The problem is poorly worded, imho. The question asking "how fast" could have been made more clear.
• November 20th 2012, 10:26 AM
MarkFL
Re: Newton's Law of Gravitation
You are most likely right, as no information is given about the speed of ascent. When I hear "how fast" I think of a time rate of change.
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