At the instant a race began, a 65-kg sprinter exerted a force of 720 N on the starting block at a…

At the instant a race began, a 65-kg
sprinter exerted a force of 720 N on the starting block at a 22° angle with
respect to the ground, (a) What was the horizontal accelera tion of the
sprinter? (b) If the force was exerted for 0.32 s, with what speed did the
sprinter leave the starting block?