来自贾建波的问题
【火车的速度为8m/s,关闭发动机后前进70m时速度减为6m/s.若再经过50s,火车又前进的距离为()A.50mB.90mC.120mD.160m】
火车的速度为8m/s,关闭发动机后前进70m时速度减为6m/s.若再经过50s,火车又前进的距离为()
A.50m
B.90m
C.120m
D.160m
1回答
2020-04-09 22:11
【火车的速度为8m/s,关闭发动机后前进70m时速度减为6m/s.若再经过50s,火车又前进的距离为()A.50mB.90mC.120mD.160m】
火车的速度为8m/s,关闭发动机后前进70m时速度减为6m/s.若再经过50s,火车又前进的距离为()
A.50m
B.90m
C.120m
D.160m
设火车的加速度为a,根据v