Two particles of mass m and M initially at rest at infinite distance. Find their relative velocity of approach due to gravitational force of attraction when their separation is a at any instant

Two particles of mass m and M initially at rest at infinite distance.

1.	Two particles of mass m and M initially at rest at infinite distance. Find their relative velocity of approach due to gravitational force of attraction when their separation is a at any instant
Answer» `SQRT((2G(M +m))/(a))` `sqrt((GMm)/((M + m)a))` `sqrt((2G(M+2m))/(a))` `sqrt((G(M +m))/(2A))` ANSWER :A