[填空题]
An 0.145-kg baseball pitched horizontally az3mip78a-cx 6mo f -3w7cfgest strikes a bat and ie8huty+;sx(c 1sp.t ms popped straight up to a height of 55.6 m. If the contact time is 1.4 ms, calculate the average force on the ball during thu h.c+ s;se t1tp(x8mye contact. $^{\circ} $
