[填空题]
Suppose the force acting on a tennis ball (mass 0.060 kg) ,78xmyt -ksmafekr ()points in the g* l7t7vn kvx(p1 ixp8+x direction and is given by the graph of Fig. 7–33 as a function of time. Use graphical methods to est7xxp1 lpnv8g7t*(i v kimate
(a) the total impulse given the ball N*s
(b) the velocity of the ball after being struck, assuming the ball is being served so it is nearly at rest initially. m/s