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Question

A bullet of mass m is fired in the horizontal direction with a velocity u. This bullet gets embedded in a bag of sand lying in a truck. If the mass of truck is M then the velocity of truck after the collision will be-

A
mu(M+m)
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B
m(M+m)u
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C
mM(M+m)u
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D
zero
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Solution

The correct option is B mu(M+m)
By conservation of Momentum principle,
Mi=mu
Mf=(m+M)v
Mi=Mf=mu=(m+M)v
v=mum+M

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