"Given a planet has mass M and radius R, find the speed it would have to be launched at. Compare this to the speed required to put the object in the circular orbit."(adsbygoogle = window.adsbygoogle || []).push({});

I understand the first half where E_{p}=E_{k}

i.e: GMm/r = 1/2 mv^{2}

rearrange to find v

how ever, i'm unsure of what exactly the 'orbit velocity' is.

is the the value of v in centripetal force, F = mv^{2}/r

is this the same as the speed needed to launch it in to orbit or what? i am rather stumped here..

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# Escape velocity/orbit velocity

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