(简答题)
如图(a)所示,一小型迫击炮架设在一斜坡的底端O 处,已知斜坡倾角为α,炮身与斜坡的夹角为β,炮弹的出口速度为v0,忽略空气阻力.求: (1)炮弹落地点P 与点O 的距离OP; (2) 欲使炮弹能垂直击中坡面.证明α和β必须满足并与v0 无关.
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