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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 constant. Then at a separation r

A

The total energy of the two object is zero.

B

Their relative velocity is `sqrt((10Gm)/r)` in magnitude

C

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

D

Their relative velocity is zero.

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A, B, C
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