如图所示，质量相同的两物体处于同一高度，A沿固定在地面上的光

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如图所示，质量相同的两物体处于同一高度，A沿固定在地面上的

光滑斜面下滑，B自由下落，最后到达同一水平面，则 (　　)
A．重力对两物体做的功相同
B．重力的平均功率相同
C．到达底端时重力的瞬时功率相同
D．到达底端时两物体的动能相同，速度相同

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