Question

1.一个人坐在一辆速度为54Km/h的火车窗口边,迎面开来一列火车,速度为36km/h,它的长度为150m,那么这人看见

Answer 1

1)54Km/h=15m/s,36km/h=10m/s,速度25m/m,15025=6s.

2)600/4=150s,0.5cm/s=0.005m/s,0.9/0.005=180s,可以180》150

2）600/4=150s,0.5cm/s=0.005m/s,0.005乘以150为0.75m,小于0.9m,可以