Work, Power and EnergyHard
Question
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 :-
Options
A.
mv2 × 
mv2 × B.mv2 × 
mv2 × C.mv2 × 
mv2 × D.Mv2 × 
Mv2 × Solution
From momentum conservation law
mV = (M + m)V′
V′ =
so KE =
(M + m)V′2 = 
mv2 
mV = (M + m)V′
V′ =
so KE =
(M + m)V′2 = mv2 Create a free account to view solution
View Solution FreeMore Work, Power and Energy Questions
Two men with weights in the ratio 5 : 3 run up a staircase in times in the ratio 11 : 9. The ratio of power of first to ...A man pushes a wall and fails to displace it. He does-...A particle is projected along the inner surface of a smooth vertical circle of radius R, its velocity at the lowest bein...A planet moves round the Sun in an elliptical orbit such that its K.E. is k1 and k2 when it is nearest to the Sun and fa...A block of mass 0.50 kg is moving with a speed of 2.00 m/s on a smooth surface. It strikes another mass of 1.00 kg and t...