$A$ body of mass $6 ~kg$ is under a force which causes displacement in it given by $s = \frac{t^2}{4}$ metres,where $t$ is time. The work done by the force in $2$ seconds is: (in $~J$)

  • A
    $12$
  • B
    $9$
  • C
    $6$
  • D
    $3$

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