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A ball A of mass 10kg and a ball B of un...

A ball A of mass 10kg and a ball B of unknown mass are placed on a horizontal frictionless table which rest against a rigid wall as shown in figure-4.135. The hail A moves towards the ball B with a velocity v.What should be the mass of B such that both A and B move with the same speed after A has undergone a collision with ball B and the wall ? All collisions are assumed to the elastic.

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`[30kg]`
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