小汽车以18km/h的速度,用0.5min匀速通过一公路隧道,这座隧道长______m.
v=18km/h=18×
m/s=5m/s,t=0.5min=30s,1 3.6
∵v=
,s t
∴s=vt=5m/s×30s=150m;
这座隧道长为150m.
故答案为:150.
小汽车以18km/h的速度,用0.5min匀速通过一公路隧道,这座隧道长______m.
v=18km/h=18×
m/s=5m/s,t=0.5min=30s,1 3.6
∵v=
,s t
∴s=vt=5m/s×30s=150m;
这座隧道长为150m.
故答案为:150.