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The displacement x of a particle moving in one dimension under the action of a constant force is related to the time t by the equation t=√x+3 , where x is in meters and t is in seconds. The work done by the force in the first 6 seconds is

(a)  9 J                                       (b)  6 J

(c)   0 J                                       (d)  3 J

Answer: C

(5)

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