A $7\mathrm{.}10$kg block with an initial velocity of $1\mathrm{.}80$m$/$s is acted on by a force,

F $=(5\mathrm{.}00$t $-6\mathrm{.}50$t Ni$.$ If this force acts on the block from t $=0\mathrm{.}00$s to t $=3\mathrm{.}50$s$,$ a$)$ what is the

impulse on block? b$)$ What is the final velocity of the block?