A car weighing 7200 Newton moves along a level highway with a speed of 61 km/h. The power of the engine at this speed is 72 kW. The car encounters a hill inclined at an angle of 6.9 degree with respect to the horizontal.
If there is no change in the power of the engine, and no change in the resistive forces acting on the car, estimate what is the new speed of the car on hill?
Answer in units of km/h.