英语翻译A catapult,positioned on top of a small hill that is 20

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英语翻译
A catapult,positioned on top of a small hill that is 20 m high,launches its
ammunition at a target at the bottom of the hill.Suppose the ammunition is launched at 40 m/s
with an angle of 20 degrees above the horizontal.
a) Find the time for the target to get hit.
b) How much horizontal distance separates the target and the catapult?

条件：一个弹弓被架设在20米高的小山坡的坡顶,瞄准山坡脚下的目标发射飞弹.假设飞弹以40米每秒的速度与水平面呈20度的角度被弹射出去.
要求：a）计算出目标被飞弹击中所需时间；
b）计算出目标与弹弓之间的水平距离.
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