Question

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Answer 1

$P=75kW=75000 W\\v_{med}=180 km/h=50 m/s\\P=F*v_{med}=>F=\frac{P}{v_{med}}=\frac{75000}{50}= 1500N\\\vec{F}+\vec{F_r}+\vec{G}+\vec{N}=0\\Ox:F-F_r=0\\Oy:N-Mg=0\\F_r=fG=fMg\\F-F_r=0<=>F-fMg=0=>f=\frac{F}{Mg}=\frac{1500}{1500*10}=0,1=>f=0,1$