An 8 gm bullet is fired horizontally into a 9 kg block of wood and sticks in it. The block which is free to move, has a velocity of 40 cm/s after impact. The initial velocity of the bullet is

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450 m/s

450 cm/s

220 m/s

220 cm/s

answer is A.

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Detailed Solution

mu =(m+M)v

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