一物体受到竖直向上的拉力F,当拉力F1=42N时,物体向上的加速度a1=4.0m/s2次方,不计空气阻力,g取10m/s二次方.(1)物体的质量m(2)物体由静止开始向上运动2s内的位移和2s末的速度? 速度啊 急啊!跪求!
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![一物体受到竖直向上的拉力F,当拉力F1=42N时,物体向上的加速度a1=4.0m/s2次方,不计空气阻力,g取10m/s二次方.(1)物体的质量m(2)物体由静止开始向上运动2s内的位移和2s末的速度? 速度啊 急啊!跪求!](/uploads/image/z/5009785-25-5.jpg?t=%E4%B8%80%E7%89%A9%E4%BD%93%E5%8F%97%E5%88%B0%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8A%E7%9A%84%E6%8B%89%E5%8A%9BF%2C%E5%BD%93%E6%8B%89%E5%8A%9BF1%3D42N%E6%97%B6%2C%E7%89%A9%E4%BD%93%E5%90%91%E4%B8%8A%E7%9A%84%E5%8A%A0%E9%80%9F%E5%BA%A6a1%3D4.0m%2Fs2%E6%AC%A1%E6%96%B9%2C%E4%B8%8D%E8%AE%A1%E7%A9%BA%E6%B0%94%E9%98%BB%E5%8A%9B%2Cg%E5%8F%9610m%2Fs%E4%BA%8C%E6%AC%A1%E6%96%B9.%281%29%E7%89%A9%E4%BD%93%E7%9A%84%E8%B4%A8%E9%87%8Fm%282%29%E7%89%A9%E4%BD%93%E7%94%B1%E9%9D%99%E6%AD%A2%E5%BC%80%E5%A7%8B%E5%90%91%E4%B8%8A%E8%BF%90%E5%8A%A82s%E5%86%85%E7%9A%84%E4%BD%8D%E7%A7%BB%E5%92%8C2s%E6%9C%AB%E7%9A%84%E9%80%9F%E5%BA%A6%3F++%E9%80%9F%E5%BA%A6%E5%95%8A++%E6%80%A5%E5%95%8A%21%E8%B7%AA%E6%B1%82%21)
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