Question

初二物理题运动的速度 急~~~某飞机从武汉飞往北京,若飞机在空中匀速飞行,在前25min内飞行了300km,（1）飞机飞

Answer 1

1)

v = 300km/25min=3*10^5/25*60 = 200m/s

v = 300km/25*60s = 0.2km/s

2)

因为匀速飞行,所以不变

V = 200m/s

3)

S = vt = (200m/s) * (0.2*60*60s) = 144000m

导火线时间t=100cm/(0.5cm/s) =200s

工人跑时间t=600/4=150s

能