The second difference is the equal sign instead of less-than-or-equal. This means the frictional force is constant as long as the object is sliding—it doesn’t equal the applied force anymore. That means the net force isn’t zero. Push harder on the chair by running and the chair will speed up.
Раскрыты подробности похищения ребенка в Смоленске09:27
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placed into a child's hands.，更多细节参见谷歌
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