公路斜坡长100 m,汽车以20 m/s的初速度自坡底匀减速上坡,加速度大小为1.5 m/s,则汽车自坡底至坡顶所用的时间为 ( )
A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108152293269326.gif" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108152252075207.gif" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108152373897389.gif" alt="" border="0" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108152344324432.gif" alt="" border="0" />