The graph between the resistive force F ...

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

50 J

40 J

20 J

10 J

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The correct Answer is:

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

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