做自由落体运动的小球,落到A点时的速度为20m/s,则小球经过A点上方12.8m处的速度大小为多少m/s?经过A点下方25m处的速度大小为多少m/s?[g取10m/s2}
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![做自由落体运动的小球,落到A点时的速度为20m/s,则小球经过A点上方12.8m处的速度大小为多少m/s?经过A点下方25m处的速度大小为多少m/s?[g取10m/s2}](/uploads/image/z/7659918-54-8.jpg?t=%E5%81%9A%E8%87%AA%E7%94%B1%E8%90%BD%E4%BD%93%E8%BF%90%E5%8A%A8%E7%9A%84%E5%B0%8F%E7%90%83%2C%E8%90%BD%E5%88%B0A%E7%82%B9%E6%97%B6%E7%9A%84%E9%80%9F%E5%BA%A6%E4%B8%BA20m%2Fs%2C%E5%88%99%E5%B0%8F%E7%90%83%E7%BB%8F%E8%BF%87A%E7%82%B9%E4%B8%8A%E6%96%B912.8m%E5%A4%84%E7%9A%84%E9%80%9F%E5%BA%A6%E5%A4%A7%E5%B0%8F%E4%B8%BA%E5%A4%9A%E5%B0%91m%2Fs%3F%E7%BB%8F%E8%BF%87A%E7%82%B9%E4%B8%8B%E6%96%B925m%E5%A4%84%E7%9A%84%E9%80%9F%E5%BA%A6%E5%A4%A7%E5%B0%8F%E4%B8%BA%E5%A4%9A%E5%B0%91m%2Fs%3F%5Bg%E5%8F%9610m%2Fs2%7D)
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