Question

if final momentum is equal to initial momentum of the system then
a) no net force on the system
b) always net force on the system
c) may be net force on the system d) both (1) and (2)
plz give answer with elaborate

Answer 1

a) No net force on the system

Explanation:
Force = Rate of change of momentum

If initial and final momentum is same then rate of change of momentum is zero. Therefore, force on the system is also zero.

Answer 2

No net force on the system.

As m1v1 = m2v2

Velocity at initial point is equal to velocity at final point with mass remaining constant.

Hope it helps!