Impulse of a time-varying force

A body of mass $4.0\mathrm{kg}$, initially at rest on a smooth horizontal plane, is pushed by a horizontal force of fixed direction and magnitude $F(t)=6.0t$, with $F$ in newtons and $t$ in seconds, for $0\le t\le 2.0\mathrm{s}$. Compute the impulse of the force and the velocity of the body at time $t=2.0\mathrm{s}$.