Do you go to MCC? Is this from Madeline's worksheet? I am stuck on this too!

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- Nov 19th 2012, 11:04 PMcherryblossom289Re: Newton's Law of Gravitation
Do you go to MCC? Is this from Madeline's worksheet? I am stuck on this too!

- Nov 20th 2012, 12:19 AMMarkFLRe: Newton's Law of Gravitation
Do you follow what has been posted so far? If not I will be glad to try to explain.

- Nov 20th 2012, 07:32 AMskeeterRe: Newton's Law of Gravitation
In this case, I believe the magnitude of F given should be differentiated w/r to r ...

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

$\displaystyle \frac{dF}{dr} = -\frac{2k}{r^3}$ where $\displaystyle \frac{dF}{dr}$ is a rate of change of force magnitude in $\displaystyle \frac{N}{m}$ 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. - Nov 20th 2012, 09:26 AMMarkFLRe: 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.