Question

How can you relate a force with the change of momentum of a body​

Answer 1

Force is a measure of the change of momentum over time. It can be written as F = mass x change in velocity / time. In practical terms, the momentum of an object increases when a force is acting upon it, because the force is causing it to accelerate, and to have an increase in velocity.
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Answer 2

HEY!!!

linear momentum of a body =

mass × velocity

but when force is applied on a moving body it's velocity changes .Due to change in velocity of body it's momentum also changes...

So,

initial momentum =mass(m) ×inital velocity(u)

final momentum =mass(m)× final velocity(v)

So...

Change in momentum of body in t seconds

=mv-mu

=m(v-u)

So....

rate of change of momentum

=change in momentum /time

=m(v-u)/t

but acceleration=v-u /t

so...

rate of change of momentum =ma