物A重<img src="https://zk.995w.com/lqwvjeImg/fb/fb0a130af2d78d10a3b321fa9022dd94.png" style="width:46px;height:18px;">,物B重<img src="https://zk.995w.com/lqwvjeImg/c1/c196d9a88ec59beaa455e4aaa50bb257.png" style="width:40px;height:18px;">,<img src="https://zk.995w.com/lqwvjeImg/3b/3b2994fc1dd7db8f183a88d74cb590d3.png" style="width:16px;height:17px;">物与地面的摩擦系数为0.2,滑轮处摩擦不计。则物体A与地面间的摩擦力为( )<img src="https://zk.995w.com/lqwvjeImg/ea/ea2ca4b899c045b14e7585aa777fcb89.png" style="width:24px;height:18px;">。<img src="https://zk.995w.com/lqwvjeImg/26/268c59990cacee339f2a2026591a9eac.png" style="font-size: 20px; width: 173px; height: 155px;"><br>·20<br>·16<br>·15<br>·12