The graph between the resistance force F...

The graph between the resistance force F acting on a body and the distance covered by the body is shown in the figure. The mass of the body is 25kg and initial velocity is `2 m//s^(2)`. When the distance covered by the body is 4m, its kinetic energy would be

50 J

40J

20J

10 J

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The correct Answer is:

Area under curve `=(1)/(2) (4)(20)=40 J`
W=work done by resistive F=-40 J
-40 =`K_(f)-K_(i), K_(i)=50 J,` so `K_(f)=50-40 =10 J`

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