Under the action of a force of 30 kN, the car moves at a speed of 4 m / s. find the power of its engine.

These problems: F (the force acting on the vehicle under consideration) = 30 kN (30 * 10 ^ 3 N); V (speed of movement) = 4 m / s.

The engine power of the car in question is equal to the product of the acting force and the speed of movement: N = F * V.

Let’s perform the calculation: N = 30 * 10 ^ 3 * 4 = 120 * 10 ^ 3 W (120 kW).

Answer: The engine of the car in question has a power of 120 kW.