A 710kg car drives at a constant speed of 23m/s . It is subject to a drag force of 500 N. What power is required from the car's engine to drive the car (a) on level ground? (b) up a hill with a slope of 2.0∘ ?

Answer 1

(a)
F=F(dr)
P=Fv=500•23 =11500 N
(b)
F=F(dr)+mgsinα=500+710•9.8•sin2=500+242.8 =742.8 N
P=Fv=742.8•23=17085 N