如图,根据其参考答案算出的弹性势能变化量ΔEp=E^2Qa(Qa+Qb)/k,但我用ΔEp=1/2kx1^2-1/2kx2^2结果却算出来ΔEp=E^2(Qb^2-Qa^2)/2k,这是怎么回事?
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![如图,根据其参考答案算出的弹性势能变化量ΔEp=E^2Qa(Qa+Qb)/k,但我用ΔEp=1/2kx1^2-1/2kx2^2结果却算出来ΔEp=E^2(Qb^2-Qa^2)/2k,这是怎么回事?](/uploads/image/z/3443546-2-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%A0%B9%E6%8D%AE%E5%85%B6%E5%8F%82%E8%80%83%E7%AD%94%E6%A1%88%E7%AE%97%E5%87%BA%E7%9A%84%E5%BC%B9%E6%80%A7%E5%8A%BF%E8%83%BD%E5%8F%98%E5%8C%96%E9%87%8F%CE%94Ep%3DE%5E2Qa%28Qa%2BQb%29%2Fk%2C%E4%BD%86%E6%88%91%E7%94%A8%CE%94Ep%3D1%2F2kx1%5E2-1%2F2kx2%5E2%E7%BB%93%E6%9E%9C%E5%8D%B4%E7%AE%97%E5%87%BA%E6%9D%A5%CE%94Ep%3DE%5E2%28Qb%5E2-Qa%5E2%29%2F2k%2C%E8%BF%99%E6%98%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B%3F)
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