在拉力F的作用下,重30N的物体A以5m/s的速度在水平桌面上作匀速直线运动,此时绳对A物体的拉力为20N,则拉力F为多少?在拉力F作用下4秒内做功多少?功率多少?
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![在拉力F的作用下,重30N的物体A以5m/s的速度在水平桌面上作匀速直线运动,此时绳对A物体的拉力为20N,则拉力F为多少?在拉力F作用下4秒内做功多少?功率多少?](/uploads/image/z/3572038-46-8.jpg?t=%E5%9C%A8%E6%8B%89%E5%8A%9BF%E7%9A%84%E4%BD%9C%E7%94%A8%E4%B8%8B%2C%E9%87%8D30N%E7%9A%84%E7%89%A9%E4%BD%93A%E4%BB%A55m%2Fs%E7%9A%84%E9%80%9F%E5%BA%A6%E5%9C%A8%E6%B0%B4%E5%B9%B3%E6%A1%8C%E9%9D%A2%E4%B8%8A%E4%BD%9C%E5%8C%80%E9%80%9F%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8%2C%E6%AD%A4%E6%97%B6%E7%BB%B3%E5%AF%B9A%E7%89%A9%E4%BD%93%E7%9A%84%E6%8B%89%E5%8A%9B%E4%B8%BA20N%2C%E5%88%99%E6%8B%89%E5%8A%9BF%E4%B8%BA%E5%A4%9A%E5%B0%91%3F%E5%9C%A8%E6%8B%89%E5%8A%9BF%E4%BD%9C%E7%94%A8%E4%B8%8B4%E7%A7%92%E5%86%85%E5%81%9A%E5%8A%9F%E5%A4%9A%E5%B0%91%3F%E5%8A%9F%E7%8E%87%E5%A4%9A%E5%B0%91%3F)
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