NEET2008PhysicsWork, Power and EnergyActual
A bullet is fired from a rifle and the rifle recoils. Kinetic energy of rifle is
Options
- Aless than K.E. of bullet
- Bgreater than K.E. of bullet
- Cequal to K.E. of bullet
- Dnone of the above
Correct answer
B. greater than K.E. of bullet
Step-by-step solution
Momentum of rifle = Momentum of bullet m₁ v₁=m₂ v₂ , Also m₁>m₂ aligned & K.E. of rifle K.E. of bullet = 1 2 m₁ v₁^2 1 2 m₂ v₂^2 & = m₁^2 v₁^2 m₁ m₂ m₂^2 v₂^2 = m₂ m₁ aligned K.E. of rifle is less than K.E. of bullet.