physics
posted by eli .
if a car generates 18 hp when traveling at a steady 88 km/h, what must be the average force exerted on the car due to friction and air resistance

If the proper units are used (Watts, m/s and newtons, for example),
Power = Force * Velocity
First convert to SI units:
88 km/h = 24.44 m/s
18 Hp = 13,428 Watts
Force = P/V = 549 newtons 
13,428/24.4= 5.5x10^2N
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