Friction coefficient

What is the weight of a car when it moves on a horizontal road at a speed of v = 50 km/h at engine power P = 7 kW? The friction coefficient is 0.07

Correct result:

m =  720 kg

Solution:

v=50 km/h→ m/s=50/3.6  m/s=13.88889 m/s P=7000 W t=0.07 g=10 m/s2  P=Fv  F=P/v=7000/13.8889=504 N  F=tmg  m=F/(t⋅ g)=504/(0.07⋅ 10)=720 kg

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