The acceleration of a particle moving in a straight line varies with its displacement as $a=2s$ velocity of particle is zero at zero displacement. The corresponding velocity displacement equation is

Question

$$(a)\;v=\sqrt {2s} \quad (b)\;v=\pm \sqrt 2 s \quad (c)\;v^2=\frac{2}{s} \quad (d)\;v=\pm \frac{2}{s}$$