A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a round about (Fig. 11.1) of radius 100 m.
Displacement = 1500 m + 200 m + 2000 m = 3700 m
Work done = Force X displacement = 5 N X 3700 m = 18500 J
(Note: We do not need to calculate the circumference because we need to take displacement and not distance)
