A car of mass is travelling at

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

Problem

A car of mass

1200\,\text{kg}

is travelling at

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

. The engine delivers a constant useful mechanical power of

50\,\text{kW}

for

12\,\text{s}

. (i) Calculate the increase in the car's kinetic energy during this interval. (ii) Determine the speed of the car at the end of the

12\,\text{s}

period.