Question

A one-ton car moves with a constant velocity of
15 ms–1 on a rough horizontal road. The total resistance to
the motion of the car is 12% of the weight of the car. The
power required to keep the car moving with the same
constant velocity of 15ms⁻¹ is
[Take g = 10 ms⁻²]
(a) 9 kW (b) 18 kW
(c) 24 kW (d) 36 kW

Answer 1

F=R×m×g=10012×1000×10N=1200N

P=Fv=1200N×15ms−1=18kW