（1）第一问求t为何值时球达到最大高度
y'(t)=-32t+14 令其等于0 解得t=7/16 再带入 y(t),=-16t^2+14t+250 解得最大高度
（2）第二问球什么时候落地
令y(t),=-16t^2+14t+250=0 解得的t（取正的那个）就是
（3）问球落地时的速度
把第二问解得的t带入y'(t)=-32t+14 结果就是落地的速度
求解一道AP微积分应用题!A ball is thrown upward from the top of a build
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