英语翻译A tennis ball thrown horizontally from the top of a wate

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英语翻译
A tennis ball thrown horizontally from the top of a water tower lands 20m from the base of the tower.if the tennis ball is initially thrown at a velocity of 10m/s,how high is the water tower?How long does it take the tennis ball to reach the ground?

从水塔距地面20米处的地方水平抛出的一个网球,如果初速度10 m / s,问水塔有多高?需要多长时间到达地面? 再答：还可以问，希望帮到了你。期待好评。
再问：怎么写..... 步骤。加速度什么的忘光了
再答：加速度是9.8牛每秒吧，利用距离时间s=vt
再问：还是不会

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