A bullet traveling along the x axis at a velocity v _{x} = v_{b} strikes a telephone pole and penetrates a distance d before stopping. Assuming that the acceleration was constant, the time required to stop the bullet is.

A. d / v_{b}

B. 2d / v_{b}

C. d / 2v_{b}

D. √2d / g

E. v_{b }/ d

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