October 6th, 2008, 01:30 PM  #1 
Newbie Joined: Oct 2008 Posts: 1 Thanks: 0  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 
October 6th, 2008, 07:21 PM  #2 
Senior Member Joined: Jul 2008 Posts: 895 Thanks: 0  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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