Physics

Problem

A car of mass

1200\,\text{kg}

is driven by a motor that supplies constant mechanical power of

25\,\text{kW}

. The resistive (drag) force of air on the car is

80v

, where

v

is the instantaneous speed in

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

. Calculate the acceleration of the car when its speed is

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