问题标题：
在平直的公路上行驶的汽车,受到水平方向的牵引F1和阻力F2的作用,在F1=F2,F1小于F2和F1大于F2三种情况下,汽车将·····················································
问题描述：
在平直的公路上行驶的汽车,受到水平方向的牵引F1和阻力F2的作用,在F1=F2,F1小于F2和F1大于F2三种情况下,汽车将································································怎样?
秦天保回答：
F1=F2,汽车做匀速直线运动.
F1小于F2,汽车做减速直线运动.
F1大于F2,汽车做加速直线运动.
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