题目内容
一位同学骑自行车行驶在一段公路上,前5min行驶了1200m,然后又用0.5h行驶了8km,最后用5min行驶1000m.这位同学骑自行车前5min的平均速度是______m/s,中途8km路程中的平均速度是______m/s,通过整段公路的平均速度是______m/s.
前5min行驶了1200m,则该段的平均速度为:
t1=5min=300s
v1=
=
=4m/s;
中途8km的平均速度为:
S2=8km=8000m;t2=0.5h=1800s
v2=
=
=4.4m/s;
全程的平均速度:
S=1200m+8000m+1000m=10200m;
t=300s+1800s+300s=2400s;
v=
=
=4.25m/s.
故答案为:4m/s;4.4m/s;4.25m/s.
t1=5min=300s
v1=
S1 |
t1 |
1200m |
300s |
中途8km的平均速度为:
S2=8km=8000m;t2=0.5h=1800s
v2=
S2 |
t2 |
8000m |
1800s |
全程的平均速度:
S=1200m+8000m+1000m=10200m;
t=300s+1800s+300s=2400s;
v=
S |
t |
10200m |
2400s |
故答案为:4m/s;4.4m/s;4.25m/s.
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