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October 6th, 2008, 02:30 PM   #1
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Keplers laws

I don't know how to start the problem
what force is required so that particle of mass m has the position function r(t)=t^3i+t^2j+t^3k
can anyone walk me through this problem?
thank you
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October 6th, 2008, 08:21 PM   #2
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Re: Keplers laws

Do you mean to reach that position from the origin?

Step 1: F = ma and a = the second derivative [in each direction] wrt time.
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