1,5.4km/h=1.5m/s
时间T=15m/1.5=10s
功W=Pt=120kw*10s=1200kJ
阻力F=P/v=120kw/1.5m/s=80000牛
2,总功W1=120kw*10S=1200KJ
有用功W2=mgh=6.0×10³kg*10*5=300kJ
效率=300kJ/1200KJ=0.25
1,5.4km/h=1.5m/s
时间T=15m/1.5=10s
功W=Pt=120kw*10s=1200kJ
阻力F=P/v=120kw/1.5m/s=80000牛
2,总功W1=120kw*10S=1200KJ
有用功W2=mgh=6.0×10³kg*10*5=300kJ
效率=300kJ/1200KJ=0.25