如右图所示,在“研究平抛物体运动”的实验中,用一张印有小方格

如右图所示,在“研究平抛物体运动”的实验中,用一张印有小方格的纸记录轨迹,小方格的边长L=1.25cm。若小球在平抛运动途中的几个位置如图中的abcd所示,则小球平抛的初速度的计算式为vo=      (用Lg表示),]其值是     (取g=9.8m/s2),小球在b点的速率是      。(结果都保留两位有效数字)

答案

   0.70m/s    0.88m/s

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