If two balls collide in air while moving vertically, then momentum of the system is conserved be....

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If two balls collide in air while moving vertically, then momentum of the system is conserved because
\( \mathrm{P} \)
(1) gravity does not affect the momentum of the
W)
system
(2) force of gravity is very less compared to the impulsive force
(3) impulsive force is very less than the gravity
(4) gravity is not acting during collision


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