1  推冰块问题

A、B两处被一堵长度为2x的墙MN隔开，MN与AB互相垂直平分，A、B两处与墙的距离均为20m.
在A处有一块重达1000kg的静止的冰块，现在要把它推到B处.
最大的推力为1000N，方向可以任意改变，没有最大速度限制.
冰块最终必须静止在B处，而且运动的过程中不能撞墙.
地面被冰雪覆盖，完全光滑，冰块的运动不受任何阻力(除了推力).
请设计一种推法，使冰块从A处运动到B处所用时间最短.

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A←-20m-→|←-20m-→B
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``````````N``````````

作者： 东方角落   2007-3-26 22:03 　 回复此发言