A 710 kg car travels along US-321. How much working is needed to keep the car traveling at a constant speed of 21.1 m/s around a curve of radius 28.2 m?
2 answers
None. Think out why, and post, we will be happy to critique your thinking. This is akin to asking how much work is needed to keep a satellite in orbit.
Because work=force*distance. The net force is zero for a car traveling along a level road at constant velocity. The zero total work explains why the car’s speed doesn’t change.