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Two objectes of mass m and 4m are at rest at and infinite seperation. They move towards each other under mutual gravitational attraction. If G is the universal gravitational constant. Then at seperation r

A

the total energy of the two objects is zero

B

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

C

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

D

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

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The correct Answer is:
A, B, C, D
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