[填空题]
Suppose the force acting onivwgv/qt/ vlq+z+0 q6 a tennis ball (m)ro b 1tbv5q6y: j:m+h 2vibz6v3hv meass 0.060 kg) points in the +x direction and is given by the graph of Fig. 7–33 as)+ i qv6b1hytm hrvbve zj3bov5m::2 6 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
