NCERT Exemplar Solutions Class 9 Science Solutions for Work and Energy - Exercise in Chapter 11 - Work and Energy

Question 12 Work and Energy - Exercise

A boy is moving on a straight road against a frictional force of 5 N. After traveling a distance of 1.5 km he forgot the correct path at a roundabout (Fig. 11.1) of radius 100 m. However, he moves on the circular path for one and a half-cycle, and then he moves forward up to 2.0 km. Calculate the work done by him.


Workdone = force × Displacement

Displacement = 1500m + 200m + 200m = 1700

Workdone = 5 ×1700 = 18500 J

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