Physics

Problem

60\,\text{kg}

runner accelerates from rest to

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

. (i) Calculate the kinetic energy gained by the runner. (ii) A chocolate bar supplies

210\,\text{kcal}

of energy

(1\,\text{kcal}=4.2\,\text{kJ})

. Comment, with calculations, on whether one chocolate bar provides enough energy for this acceleration.