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A bullet of mass m moving with velocity v strikes a block of mass Mat rest and gets embedded into it. The kinetic energy of the composite block will be
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Correct option is A
According to law of consecrations of momentummv=(m+M)v′ where v′= velocity of composite block ∴ V′=mM+mV K.E. of composite block =12(M+m)v′2 ∴ K.E. =12(M+m)mM+m2v2 =12mv2mM+mSimilar Questions
If fig four identical spheres of equal mass m are
suspended by wires of equal length /, so that all spheres are almost touching to each other. If the sphere 1 is released from the horizontal position and
all collisions are elastic, the velocity of sphere 4 iust after collision is
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