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
Water is falling on the blades of a turbine at a rate of 100 kg/sec. from a certain spring. If the height of the spring ...A solid sphere is moving and it makes an elastic collision with another stationary sphere of half of its own radius. Aft...The mass of a bucket full of water is 15 kg. It is being pulled up from a 15m deep well. Due to a hole in the bucket 6 k...Two masses m1 = 2kg and m2 = 5kg are moving on a frictionless surface with velocities 10m/s and 3 m/s respectively. m2 i...A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100kg and redius 10 cm. find the work to be d...