汽车以72km/h的速度在公路上行使,开向寂静的山谷.驾驶员按一下喇叭,4S后听到回声,这是汽车离山谷多远?(空气中声的传播速度是340M/S
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![汽车以72km/h的速度在公路上行使,开向寂静的山谷.驾驶员按一下喇叭,4S后听到回声,这是汽车离山谷多远?(空气中声的传播速度是340M/S](/uploads/image/z/12558025-1-5.jpg?t=%E6%B1%BD%E8%BD%A6%E4%BB%A572km%2Fh%E7%9A%84%E9%80%9F%E5%BA%A6%E5%9C%A8%E5%85%AC%E8%B7%AF%E4%B8%8A%E8%A1%8C%E4%BD%BF%2C%E5%BC%80%E5%90%91%E5%AF%82%E9%9D%99%E7%9A%84%E5%B1%B1%E8%B0%B7.%E9%A9%BE%E9%A9%B6%E5%91%98%E6%8C%89%E4%B8%80%E4%B8%8B%E5%96%87%E5%8F%AD%2C4S%E5%90%8E%E5%90%AC%E5%88%B0%E5%9B%9E%E5%A3%B0%2C%E8%BF%99%E6%98%AF%E6%B1%BD%E8%BD%A6%E7%A6%BB%E5%B1%B1%E8%B0%B7%E5%A4%9A%E8%BF%9C%3F%EF%BC%88%E7%A9%BA%E6%B0%94%E4%B8%AD%E5%A3%B0%E7%9A%84%E4%BC%A0%E6%92%AD%E9%80%9F%E5%BA%A6%E6%98%AF340M%2FS)
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