将质量为0.4kg的小球水平抛出,g取10m/s,空气阻力不计.已知高为20m.抛出的距离为40m.1、抛出时人对球所做的功2、抛出0.5s后小球的动能
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![将质量为0.4kg的小球水平抛出,g取10m/s,空气阻力不计.已知高为20m.抛出的距离为40m.1、抛出时人对球所做的功2、抛出0.5s后小球的动能](/uploads/image/z/9884855-47-5.jpg?t=%E5%B0%86%E8%B4%A8%E9%87%8F%E4%B8%BA0.4kg%E7%9A%84%E5%B0%8F%E7%90%83%E6%B0%B4%E5%B9%B3%E6%8A%9B%E5%87%BA%2Cg%E5%8F%9610m%2Fs%2C%E7%A9%BA%E6%B0%94%E9%98%BB%E5%8A%9B%E4%B8%8D%E8%AE%A1.%E5%B7%B2%E7%9F%A5%E9%AB%98%E4%B8%BA20m.%E6%8A%9B%E5%87%BA%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA40m.1%E3%80%81%E6%8A%9B%E5%87%BA%E6%97%B6%E4%BA%BA%E5%AF%B9%E7%90%83%E6%89%80%E5%81%9A%E7%9A%84%E5%8A%9F2%E3%80%81%E6%8A%9B%E5%87%BA0.5s%E5%90%8E%E5%B0%8F%E7%90%83%E7%9A%84%E5%8A%A8%E8%83%BD)
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