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> 光滑斜面的长度为L，一物体自斜面顶端由静止开始匀加速滑至底端，经历的时间为t，则下列说法不正确的是（） A．物体运动全过程中的平均速度是 B．物体在t／2时的瞬时速度是 C．物体运动到斜面中点时瞬时速度是 D．物体从顶点运动到斜面中点所需的时间是

问题：

发布时间：2024-09-07

光滑斜面的长度为L，一物体自斜面顶端由静止开始匀加速滑至底端，经历的时间为t，则下列说法不正确的是（）

A．物体运动全过程中的平均速度是

B．物体在t／2时的瞬时速度是

C．物体运动到斜面中点时瞬时速度是

D．物体从顶点运动到斜面中点所需的时间是

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