Question

Choose the incorrect option for elastic collision.

• A. Net impulse on both the particles is zero during collision.
• B. Net momentum of both particles remains conserved before and after collision in any direction even in presence of external force.
• C. No component of impulse act along common tangent direction.
• D. A pair of equal and opposite impulses act along common normal direction.

Answer 1

The correct option is B Net momentum of both particles remains conserved before and after collision in any direction even in presence of external force.

If there is no external force present then, the net momentum will be conserved for both the particles in all the direction.


$J_{12}=J_{21}$, equal and opposite impulse forces are acting only along common normal direction.
If we take both particles as a system then net impulse on both the particles is zero during collision.