Questions
A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be
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Correct option is A
By conservation of momentum, mv+M×0=(m+M)VVelocity of composite block V=mm+M vK.E. of composite block =12(M+m)V2=12(M+m) mM+m2v2=12mv2mm+M
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Two bodies having same mass 40 kg are moving in opposite directions, one with a velocity of 10 m/s and the other with 7 m/s If they collide and move as one body, the velocity of the combination is (m/s)
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