Two particles having masses of m and M respectively, attract each other according to Newton's law of gravity. Initially they are at rest at an infinite distance apart. Find their relative acceleration and show that their relative velocity of approach is(adsbygoogle = window.adsbygoogle || []).push({});

v(rel) = square root(2G(M+m)/a)

I do not even know where to start on this problem, if any could give me help that would be great.

Thank you

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# Newton's law of gravity

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