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A massive wooden plate of unknown mass M remains the equilibrium in vacuum when n bullets are fired per second on it. The mass of each bullet is m(M >> m) and it strikes the plate at the centre with speed v. If the coefficient of restitution is e, then M is equal to -


(A) m v n g                     (B) m e v n g                  (C) m v 1 + e n g                   (D) n m

dear Student,

since the n bullets hits the M impulsive force =dp/dt=nmv1=nmvthis force force must be equal to Mgnmv=MgM=nmvgREgards

 

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Collision is the mutual interaction between two or more bodies, where their velocities are affected ( changed ) . Collision can be due to physical contact or interference of force of on body on another. Types: 1 elastic collision : where momentum and kinetic energy is conserved. 2 inelastic collision : where momentum is conserved but some K. E is lost.
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