A dart is thrown at a target that is supported by a wooden backstop. It strikes the backstop with an initial velocity of $350\;m/s$ The dart comes to rest in $0.0050\;s$ What is the acceleration of the dart ?

Question

$\begin{array}{1 1} 7.0 \times 10^4 m/s^2 \\ 6.0 \times 10^3 m/s^2 \\ 2.0 \times 10^3 m/s^2 \\9.0 \times 10^3 m/s^2 \end{array} $