21.如图13—29所示,一辆小车静止在光滑的水平面上,在C、D两端置有油灰阻挡层,小车的质量为1kg,在车的水平底板上放有光滑小球A和B,质量分别为mA=1kg,mB=3kg,A,B小球间放置一被压缩的弹簧,其弹
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![21.如图13—29所示,一辆小车静止在光滑的水平面上,在C、D两端置有油灰阻挡层,小车的质量为1kg,在车的水平底板上放有光滑小球A和B,质量分别为mA=1kg,mB=3kg,A,B小球间放置一被压缩的弹簧,其弹](/uploads/image/z/4747642-34-2.jpg?t=21%EF%BC%8E%E5%A6%82%E5%9B%BE13%E2%80%9429%E6%89%80%E7%A4%BA%2C%E4%B8%80%E8%BE%86%E5%B0%8F%E8%BD%A6%E9%9D%99%E6%AD%A2%E5%9C%A8%E5%85%89%E6%BB%91%E7%9A%84%E6%B0%B4%E5%B9%B3%E9%9D%A2%E4%B8%8A%2C%E5%9C%A8C%E3%80%81D%E4%B8%A4%E7%AB%AF%E7%BD%AE%E6%9C%89%E6%B2%B9%E7%81%B0%E9%98%BB%E6%8C%A1%E5%B1%82%2C%E5%B0%8F%E8%BD%A6%E7%9A%84%E8%B4%A8%E9%87%8F%E4%B8%BA1kg%2C%E5%9C%A8%E8%BD%A6%E7%9A%84%E6%B0%B4%E5%B9%B3%E5%BA%95%E6%9D%BF%E4%B8%8A%E6%94%BE%E6%9C%89%E5%85%89%E6%BB%91%E5%B0%8F%E7%90%83A%E5%92%8CB%2C%E8%B4%A8%E9%87%8F%E5%88%86%E5%88%AB%E4%B8%BAmA%3D1kg%2CmB%3D3kg%2CA%2CB%E5%B0%8F%E7%90%83%E9%97%B4%E6%94%BE%E7%BD%AE%E4%B8%80%E8%A2%AB%E5%8E%8B%E7%BC%A9%E7%9A%84%E5%BC%B9%E7%B0%A7%2C%E5%85%B6%E5%BC%B9)
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