7.如图所示一轻弹簧的左端固定右端与一小球相连小球处于光�水平面上.现对小球施加一个方�水平�右的恒力f使小球从静止开始运动.则小球在 Template




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tomski7.如图所示一轻弹簧的左端固定右端与一小球相连小球处于光�水平面上.现对小球施加一个方�水平�右的恒力f使小球从静止开始运动.则小球在 coloring