汽车在平直公路上以速度匀速行驶,发动机功率为P,牵引力为时刻

汽车在平直公路上以速度匀速行驶,发动机功率为P,牵引力为时刻,司机减小了油门 ,使汽车的功率立即减小一半,并保持该功率继续行驶,到时刻,汽车又恢复了匀速直线运动(设整个过程中汽车所受的阻力不变)下面几个关于汽车牵引力F、汽车速度在这个过程中随时间变化的图象中正确的是:

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