Two bodies A and B of masses 20 g and 15 g respectively are on a horizontal plane A is at rest and B is moving at 5 ns to the

Question

Two bodies A and B of masses 20 g and 15 g respectively are on a horizontal plane A is at rest and B is moving at 5 ns to the left B collides with A and as a result A starts moving at 3 m s to the left What is the final velocity of B 5

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