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A force F  acting on an object varies with distance  x  as shown here. The force is in newton and   x in metre. The work done by the force  in moving the object from   x=0 to x=6m is

(a)      4.5 J

(b)  13.5 J

(c)   9.0 J

(d)  18.0 J

Answer: b

(8)

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