Question: Mechanics Question

Hi, I am trying to solve the following differential systems using dsolve numeric but there is something wrong with my code.

I am fairly new to Maple and cant work out why it is telling me that it doesnt work. COuld somebody help me?


DifferentialSystem := {diff(r(t),t$2)-r*(diff(theta(t),t)^2=-1000/r^2 ,
                            r(0)=sqrt(65), theta(0)=1.446),(diff(theta(t),t)=-6/13(0,0,1),

That is what I have typed into Maple.

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