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【单选题】
在图示系统中，均OA、AB与均的质量均为m，OA杆的长度为l1，AB杆的长度为l2，轮的半径为R，轮沿水平面作纯滚动。在图示瞬时，OA杆的角速度为ω，求整个系统的动量____________。【图片】A.
2.5 ml 1 w
B.
1.5 ml 1 w
C.
3 ml 1 w
D.
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