A lvl H2 Phy: Work Energy Power

A 1000kg car climbs a hill with 4 degree inclined at a constant speed of 12m/s.
If the mechanical power output of the engine is 20kw, find the force of air resistance acting on the car. Ignore the friction between the car tyres and the road

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Answer:

P=FxV

so F=P/V
=20000/12
=1.6 x 10³ N