An automobile of mass is equipped with an engine that can supply a constant power of

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

An automobile of mass

800\,\text{kg}

is equipped with an engine that can supply a constant power of

40\,\text{kW}

. Starting from rest on a horizontal, frictionless road, determine the time required for the car to reach a speed of

20\,\text{m\,s}^{-1}