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

question 56

Multiple Choice

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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