Question

A constant net force F acts on a body during a time interval t. If u and v are the initial and final velocity of the body respectively, the impulse Ft of this force is given by the equation Ft = mv-mu.​

Answer 1

Impulse is defined as change in momentum of an object divided by time interval.

at t= 0s

initial velocity = u , initial momentum = mu

at some time t .

final velocity = V, final momentum= mv.

now, change in momentum= ( final - initial) = ( mv-mu)

time interval = (t-0) = t

impulse force = (mv-mu)/ ( t)

Ft = (mv-mu) proved .

this law is known as Newton's second law.