Physics

Problem

A car is fitted with wheels of diameter

60\,\text{cm}

. When the car accelerates, the wheel speed increases from

720\,\text{rpm}

1080\,\text{rpm}

. What is the approximate increase in the car’s linear speed in

\text{km\,h}^{-1}

? a)

27\,\text{km\,h}^{-1}

81\,\text{km\,h}^{-1}

41\,\text{km\,h}^{-1}

20\,\text{km\,h}^{-1}