Answer
We can assume that g-forces of $28,000~g$ would be deadly to astronauts.
Work Step by Step
We can find the average acceleration:
$v_f^2 = v_0^2+2ad$
$a = \frac{v_f^2 - v_0^2}{2d}$
$a = \frac{(11,000~m/s)^2 - 0}{(2)(220~m)}$
$a = 2.75\times 10^5~m/s^2$
$a = (2.75\times 10^5~m/s^2)(\frac{1~g}{9.8~m/s^2})$
$a = 28,000~g$
Experiments have shown that some people can lose consciousness at g-forces of about $5g$. Some early experiments with g-forces have tested humans at g-forces of about $15~g$ for short periods of time. These experiments placed humans under great stress.
We can assume that g-forces of $28,000~g$ would be deadly to astronauts.
