v*v=2*a*s
18km/h=5m/s
a=5*5/2/100=0.125m/s2
重力沿斜坡分量f1=8000*9.8*0.02=1568N
重力垂直斜坡分量f2=8000*9.8*(1-0.02^2)^0.5=78400N
牵引力F
F-f1-f2*0.03=ma
F=1568+78400*0.03+8000*0.125=4920N
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