KEAM 2015 Physics and Chemistry Paper

As, we know, work done by a variable force, Wni→nf
= area under the force - displacement curve.
Work = Area of ∆ABF+ Area of ∆BCEF + Area of ∆ECDWork done by the particle as it moves from n=0 to 20m
⇒‌‌W=‌

15

2

+30+‌

15

2

⇒‌‌W=15+30=45J