A boy and a cart are moving in the same direction with the boy going twice as fast as the cart .When he gets into the cart ,the speed of the cart increases by20% .. Find the ratio of mass of cart to mass of boy
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Vb=2Vc
(Mc .Vc)+(Mb.2Vc)= (Mc+Mb).6/5Vc. (Law of conservation of momentum)
5Mc.Vc+10Mb.Vc=6Mc.Vc+6Mb.Vc
4Mb.Vc=Mc.Vc
4=Mc/Mb
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