一质点在Oxy平面内运动.运动学方程为x=2t和y=19-2t^2,(SI),则在第2秒内质点的平均速度大小为___________________,2秒末的瞬时速度大小为_______________________.
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![一质点在Oxy平面内运动.运动学方程为x=2t和y=19-2t^2,(SI),则在第2秒内质点的平均速度大小为___________________,2秒末的瞬时速度大小为_______________________.](/uploads/image/z/2486576-56-6.jpg?t=%E4%B8%80%E8%B4%A8%E7%82%B9%E5%9C%A8Oxy%E5%B9%B3%E9%9D%A2%E5%86%85%E8%BF%90%E5%8A%A8%EF%BC%8E%E8%BF%90%E5%8A%A8%E5%AD%A6%E6%96%B9%E7%A8%8B%E4%B8%BAx%3D2t%E5%92%8Cy%3D19-2t%5E2%2C%28SI%29%2C%E5%88%99%E5%9C%A8%E7%AC%AC2%E7%A7%92%E5%86%85%E8%B4%A8%E7%82%B9%E7%9A%84%E5%B9%B3%E5%9D%87%E9%80%9F%E5%BA%A6%E5%A4%A7%E5%B0%8F%E4%B8%BA___________________%2C2%E7%A7%92%E6%9C%AB%E7%9A%84%E7%9E%AC%E6%97%B6%E9%80%9F%E5%BA%A6%E5%A4%A7%E5%B0%8F%E4%B8%BA_______________________.)
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