Physics

Problem

A scooter and its rider together have a mass of

150\,\text{kg}

. While moving on a straight road the scooter attains a speed of

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

. a. (a) Calculate their kinetic energy in kilojoules. b. (b) If the kinetic energy has to be

18\,\text{kJ}

with the same total mass, determine the speed (in

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

) the scooter must attain.