While driving, one expects to spend more energy accelerating than driving at a constant speed.

(a) Neglecting friction, calculate the energy required to give a 1200-kg car a speed of 50 km/h.

(b) If friction results in a retarding force of 300 N at a speed of 50 km/h, what is the energy needed to move the car a distance of 300 m at a constant speed of 50 km/h?

(c) Assuming that the energy losses due to friction in part (a) are 75% of those found in part (b), estimate the ratio of the energy consumption for the two cases considered.