4.5km/h=?m/s

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4.5km/h=?m/s4.5km/h=?m/s4.5km/h=?m/s1.25m/s过程4.5km/h=4500m/h=4500m/3600s=1.25m/s

4.5km/h=?m/s
4.5km/h=?m/s

4.5km/h=?m/s
1.25m/s
过程4.5km/h=4500m/h=4500m/3600s=1.25m/s