Which One of the Following is Not Correct A. The Momentum is always conserved in Elastic Collision B. The Momentum is Always conserved in Non elastic Collision C. The Momentum is always conserved for Impulsive force acting On system D The Momentum of one body system under gravity is not conserved in Y Direction

(a) Momentum is conserved in elastic collision :- TRUE

 

Collision may be elastic or inelastic , momentum is always conserved

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(b)Momentum is conserved in inelastic collision :- TRUE

 

Collision may be elastic or inelastic , momentum is always conserved

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(c) Momentum is conserved for impulsive force acting on system :- FALSE

 

Impulsive force ΔF acting on system for a time Δt gives change in momentum  Δ(mv) = ΔF / Δt

 

where product of mass m and velocity v is momentum .

 

Hence momentum is not conserved because momentum is changing.

 

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(d) Momentum of one body system under gravity is not conserved :- TRUE

 

One body system under gravity is subjected to gravitational force that accelerates the body .

 

Hence there is change in momentum due to acceleration and momentum is not conserved.