The correct answer to the question is :
EXPLANATION:
As per the question, the force involved in the collision F = .
The duration of impact is given as t = .
We are asked to calculate the change in momentum.
We know that the change in momentum is equal to the impulse of a body .
The impulse of a body is defined as the product of force with time.
Hence, impulse = force × time
= F × t
=
= [ans]
Hence, the change in momentum is