Two bodies of masses 
and 
are initially at rest at infinite distance apart. They are then allowed to move towards each other under mutual gravitational attraction. Their relative velocity of approach at a separation distance r between them is
Text Solution
Verified by ExpertsThe correct answer is:
B
Let velocities of these masses at r distance from each other be 
and 
respectively.
By conservation of momentum
… (i)
By conservation of energy
change in P.E.=change in K.E.
…(ii)
On solving equation (i) and (ii)
and 
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