最佳答案:72km/h=72*1000m/60*60s=20m/s10m/s=36km/h
最佳答案:18km/h=5m/s10m/s=36km/h50cm/s= 1.8 km/h,20dm/s=7.2 km/h
最佳答案:∵1h=3600s∴10m/s=10m/1s=10m×100/(1s×3600÷36)=1km/(1h÷36)=1km/1h×36=36km/h明教为您解答,请