Question

What is impulse?what is the s.i unit of it?

Answer 1

Impulse is the integral force over a time interval. Since force is a vector quantity, impulse is also a vector quantity in the same direction. S.I. unit is Ns (Newton second)
HOPE THIS HELPS :)

Answer 2

Impulse of a constant force J acting for a time t is defined as the product of the force and time
Impulse = force * time
J = F * t
Impulse is a vector quantity and its unit id N s.