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Two objects of masses m and 4m are at re...

Two objects of masses `m` and `4m` are at rest at an infinite separation. They move towards each other under mutual gravitational attraction. If `G` is the universal gravitaitonal constant, then at separation `r`

A

the total energy of the two object is zero

B

their relative velocity of approach is `((10Gm)/(r ))^(1//2)` in magnitude

C

the total kinetic energy of the objects is `(4Gm^(2))/(r )`

D

net angular momentum of both the particles is zero about any point

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