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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 tatal energy of the two object is zero

B

Their relative velocity of approach is `((10Gm)/(r))^(1//2)` amplitude

C

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

D

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

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