A bullet (mass = m)is fired at speed V into a block of mass M (with Mm)which is hanging vertically from a light string of length L.The bullet stops in the block.If the recoiling block + bullet system reaches a height of 2/3L,then the initial speed of the bullet is given by A)M $\times$ (1gL/3)^1/2/m B)M $\times$ (2gL/3)^1/2/m C)M $\times$ (3gL/4)^1/2/m D)m $\times$ (4gL/3)^1/2/M E)M $\times$ (4gL/3)^1/2/m

Question

A bullet (mass = m)is fired at speed V into a block of mass M (with M>m)which is hanging vertically from a light string of length L.The bullet stops in the block.If the recoiling block + bullet system reaches a height of 2/3L,then the initial speed of the bullet is given by A)M $\times$ (1gL/3)^1/2/m B)M $\times$ (2gL/3)^1/2/m C)M $\times$ (3gL/4)^1/2/m D)m $\times$ (4gL/3)^1/2/M E)M $\times$ (4gL/3)^1/2/m

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The Answer of A bullet (mass = m)is fired at speed V into a block of mass M (with M>m)which is hanging vertically from a light string of length L.The bullet stops in the block.If the recoiling block + bullet system reaches a height of 2/3L,then the initial speed of the bullet is given by A)M $\times$ (1gL/3)^1/2/m B)M $\times$ (2gL/3)^1/2/m C)M $\times$ (3gL/4)^1/2/m D)m $\times$ (4gL/3)^1/2/M E)M $\times$ (4gL/3)^1/2/m

A Bullet (Mass = M)is Fired at Speed V into a Block