Work, Power and EnergyHard
Question
A bag (mass M) hangs by a long thread and a bullet (mass m) comes horizontally with velocity v and gets caught in the bag. Then for the combined (bag + bullet) system :-
Options
A.Momentum is 
B.Kinetic energy is 
C.Momentum is 
D.Kinetic energy is 
Solution
From momentum conservation law
Mv + 0 = (M + m)v′
v′ =
so K.E. =
Mv + 0 = (M + m)v′
v′ =
so K.E. =
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