A scooter and its rider together have a mass of

PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

150\,\text{kg}

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

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

. (a) Calculate their kinetic energy in kilojoules. (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.