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A vehicle moving with velocity $v$ decreases its velocity to $v/2$ after covering distance $d$.

What is the acceleration of the vehicle?

A

$ \cfrac {-v^2}{8d} $

B

$ \cfrac {-v^2}{4d} $

C

$ ​\cfrac {-3v^2}{8d} $

D

$ \cfrac {-v^2}{2d} $

E

$ \cfrac {-5v^2}{8d} $

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