一个小球以10m/s的速度在平坦的地面上开始滚动,且均匀减速,滚动了20m后球挺下来问(1)小球滚动了多少时间?(2)平均每秒小球的运动速度减少了多少?(3)小球滚动到5m是约用了几秒(精
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![一个小球以10m/s的速度在平坦的地面上开始滚动,且均匀减速,滚动了20m后球挺下来问(1)小球滚动了多少时间?(2)平均每秒小球的运动速度减少了多少?(3)小球滚动到5m是约用了几秒(精](/uploads/image/z/3614908-4-8.jpg?t=%E4%B8%80%E4%B8%AA%E5%B0%8F%E7%90%83%E4%BB%A510m%2Fs%E7%9A%84%E9%80%9F%E5%BA%A6%E5%9C%A8%E5%B9%B3%E5%9D%A6%E7%9A%84%E5%9C%B0%E9%9D%A2%E4%B8%8A%E5%BC%80%E5%A7%8B%E6%BB%9A%E5%8A%A8%2C%E4%B8%94%E5%9D%87%E5%8C%80%E5%87%8F%E9%80%9F%2C%E6%BB%9A%E5%8A%A8%E4%BA%8620m%E5%90%8E%E7%90%83%E6%8C%BA%E4%B8%8B%E6%9D%A5%E9%97%AE%EF%BC%881%EF%BC%89%E5%B0%8F%E7%90%83%E6%BB%9A%E5%8A%A8%E4%BA%86%E5%A4%9A%E5%B0%91%E6%97%B6%E9%97%B4%3F%EF%BC%882%EF%BC%89%E5%B9%B3%E5%9D%87%E6%AF%8F%E7%A7%92%E5%B0%8F%E7%90%83%E7%9A%84%E8%BF%90%E5%8A%A8%E9%80%9F%E5%BA%A6%E5%87%8F%E5%B0%91%E4%BA%86%E5%A4%9A%E5%B0%91%3F%EF%BC%883%EF%BC%89%E5%B0%8F%E7%90%83%E6%BB%9A%E5%8A%A8%E5%88%B05m%E6%98%AF%E7%BA%A6%E7%94%A8%E4%BA%86%E5%87%A0%E7%A7%92%EF%BC%88%E7%B2%BE)
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