A car is found to have a maximum speed of 140 km/h along a level road when the engine is developing a power of 50 kW. What is the resistance to motion? At what speed must an electric motor be running...

A car is found to have a maximum speed of 140 km/h along a level road when the engine is developing a power of 50 kW. What is the resistance to motion?

At what speed must an electric motor be running if it develops a torque of 6 kN m and a power of 200 kW?