[填空题]
A 0.145-kg baseball pitched rq, 49b sp6vyl3 oo):r levud)aw,,giat 39 m/s md zv,n3e 6r60mw) x/qyp-c mbis hit on a horizontal line drive straight back toward the pitcher at 52m/s If the p,zc wx)nv6m dmemr6/q-30b y contact time between bat and ball is $3\times10^{-3}$s calculate the average force between the ball and bat during contact. N
