PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
A cyclist and bicycle together have a mass of 70kg. While riding on a straight road, the speed of the bicycle increases from 4m/s to 8m/s.
(i) Calculate the work done by the cyclist in achieving this change of speed.
(ii) If the same amount of work were to be done starting from rest, find the speed that the bicycle would attain.
(iii) Using your numerical answers, comment in two sentences on how the kinetic energy of a body depends on its speed.