[填空题]
A ballplayer catches a ball 86;/y q(adxn: ,y0wwoky bie o-.0 s after tb(;7fl+jqcd2,qw cx: gg qavp0g 6b0khrowing it vertically upward. (a) With what speed 7a0 q2qkqfl:wg pg;gvcd,0jbc x6 b(+did he throw it? $m/s$ and (b) what height did it reach? $m$
