一个自由落体的苹果,剩余重量1牛,作用在苹果上的力是多少?有力作用在苹果上这个苹果就不是自由落体的了.只能按题面的大概意思回答,F=mg-1,m苹果的质量,g重力加速度.
An apple at rest weighs 1 N.The net force on the apple when
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