[填空题]
Suppose the force acting on a tenqd(il 369qib kn2w*bhnis ball (mass 0.060 kg) points in) l lxycgk i;-zteugo27ii2r.l 0h*g ; the +x direction aieuty;x)2.zk- oigc7g l;ig0l* rh 2lnd is given by the graph of Fig. 7–33 as a function of time. Use graphical methods to estimate
(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