Question

A constant force of 'F' of 12 N act on a body for 4 second Find the linear momentum?

Answer 1

p=mv

p=mvt/t

p=mat

p=ft

p=12(4)

p=48

Answer 2

Given, F = 12N

t = 4 sec

Therefor, Impulse, I = F × t

                                 = 12 × 4 = 48N-s

Also, Momentum = Change in Impulse

                             = I(final) - I(initial)

                             = 48 - 0

                             = 48 kg-m-$s^{-1}$