A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = 1 3 t 2 , where t is in seconds. Work done by the force in 2 seconds is:-

1. A. 5 19 J
2. B. 3 8 J
3. C. 8 3 J
4. D. 19 5 J

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