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> 如图所示，a、b、c三个相同的小球，a从光滑斜面顶端由静止开始自由下滑，同时b、c从同一高度分别开始自由下落和平抛.下列说法正确的有 A．它们的落地时间相同 B．运动过程中重力做的功相等 C．它们的落地时的动能相同 D．它们落地时重力的瞬时功率相等

问题：

发布时间：2024-09-07

如图所示，a、b、c三个相同的小球，a从光滑斜面顶端由静止开始自由下滑，同时b、c从同一高度分别开始自由下落和平抛.下列说法正确的有

A．它们的落地时间相同 B．运动过程中重力做的功相等

C．它们的落地时的动能相同 D．它们落地时重力的瞬时功率相等

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