The velocity of bullet is reduced from 200 m/s to 100 m/s. While travelling through a wooden block, of thickness 10m.what is the retordation.

Question

$\begin{array}{1 1} (a) \;10 \times 10^4\;m/s^2 \\ (b) \;12 \times 10^4\;m/s^2\\ (c) \;13.5 \times 10^4\;m/s^2 \\ (d) \;15 \times 10^4\;m/s^2\end{array}$