Two masses M1 and M2 are initially at re...

Two masses `M_1` and `M_2` are initially at rest at infinite distance apart. They approach each other due to gravitational interaction. Find their speed of approach at the instant, when they are distance rapart.

`sqrt((2G(m_1-m_2))/r)`

`sqrt((2G(m_1+m_2))/r)`

`sqrt(r/ (Gm_1m_2)`

`sqrt((Gm_1m_2)/r)`

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