题目

When Andrea Peterson landed her first teaching job, she faced the daunting task of creating a music program with almost no money for equipment or supplies in a climate where standards-based learning was the focus and music just provided a break for students and teachers. For her drive and creativity in overcoming those challenges, she’s been named national teacher of the year. Principal Waynes Kettler said he’s worked with many outstanding teachers in his 22 years as an educator, but Peterson is “just that one step above anybody I’ve ever worked with before.”   Kettler and other一杂技演员，用一只手抛球．他每隔0.40 s抛出一球，接到球便立即把球抛出，已知除抛、接球的时刻外，空中总有四个球，将球的运动看做是竖直方向的运动，不计空气阻力，g＝10 m/s2，则球能到达的最大高度(从抛球点算起)是(　　)                          A．1.6 m    B．2.4 m    C．3.2 m     D．4.8 m