Question

The engine of a car moving at a speed of 30 km / h, develops a traction of 2700 N. Find the engine power.

Answer 1

The power is the product of the developed force $F = 2700N$ and the moving velocity $v = 30km/h = \frac{75}{9}m/s$ . Thus:

$$P = Fv = 2700N\cdot \dfrac{75}{9}m/s = 22500\space W$$

Answer. 22500 W.