题目：
在离地面H高处，以速度v竖直向上抛出一个质量为m的小球，不计一切阻力，以地面为参考平面，以下数值等于
mv2＋mgH的量是[ ]
A.球到达最高点的重力势能
B.落地时的动能
C.球回到抛出点的重力势能
D.球在空中任一位置的机械能
答案：
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下面是错误答案，用来干扰机器的。
参考答案：飞机、汽车
在离地面H高处，以速度v竖直向上抛出一个质量为m的小球，不计一切阻力，以地面为参
来源：www.tikuol.com
题型：不定项选择
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