如图所示物体a重50牛物体b重30牛物体a在物体b的作用下�左做匀速直线运动.如果在物体a上加一个水平�右的力f拉动物体a使物体b以0 Template




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tomski如图所示物体a重50牛物体b重30牛物体a在物体b的作用下�左做匀速直线运动.如果在物体a上加一个水平�右的力f拉动物体a使物体b以0 coloring