Question

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

• A. gravity does not affect the momentum of the system.
• B. force of gravity is very less compared to the impulsive force.
• C. impulsive force is very less than the gravity.
• D. gravity is not acting during collision.

Answer 1

Answer: (B)

force of gravity is very less compared to the impulsive force.

The best option is (B), It is correct if force of gravity is much less compared to the impulsive force.
Option (A): Force of gravity will change the momentum of the system since it is an external force on the system.
Option (C): Impulsive force will be more than gravity, not less.
Option(D): Gravity will always act on the system, we cannot switch it off.