机械能量怎么求?我在国外上学,what is the total mechanical energy when a shopping trolley is pushed 10m with a force of 50N?Frictional force of 7.8N act on the shopping trolley.
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![机械能量怎么求?我在国外上学,what is the total mechanical energy when a shopping trolley is pushed 10m with a force of 50N?Frictional force of 7.8N act on the shopping trolley.](/uploads/image/z/9568516-4-6.jpg?t=%E6%9C%BA%E6%A2%B0%E8%83%BD%E9%87%8F%E6%80%8E%E4%B9%88%E6%B1%82%3F%E6%88%91%E5%9C%A8%E5%9B%BD%E5%A4%96%E4%B8%8A%E5%AD%A6%2Cwhat+is+the+total+mechanical+energy+when+a+shopping+trolley+is+pushed+10m+with+a+force+of+50N%3FFrictional+force+of+7.8N+act+on+the+shopping+trolley.)
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