Force F on a particle moving in a straight line varies with

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Force F on a particle moving in a straight line varies with distance d as shown in the figure. The work done on the particle during its displacement of 12 m is

1. 18 J
2. 21 J
3. 26 J
4. 13 J

Correct Option: D

Work done = area under F-d graph

= [2 × (7 - 3)] +		1	× 2 × (12 - 7)
		2

= 8 + 5 = 13 J.