[IKE]

Our hardest hits this year were when hybrid went awry. 15 ft/s into the wall is tough. Turns out the wall is a flexible member. Other than that, bumpers help a lot. We have some pretty vicious scars from years past.

As a little bit of how bad can it really get, I recently saw a vehicle go to 10 G's during a 5mph impact with a wall. 15 ft/s is almost 10mph. For a little math let's assume that your robot collides with a stiff wall at 3 m/s (approximately 10 ft/s). bumpers are about 3 inches thick or rough .1m Let's assume the bumpers are perfectly balanced and do an ideal deceleration.

Therefore d=V*t-1/2at^2 which is really d=V*t-1/2*V*t therefore d=1/2Vt
or t=2d/V=.2/3=1/15 second.
V=at therefore a=45m/s^2 or about 4.5 G's. This would be if the bumpers had perfect crush causing constant deceleration. If you assumed a linear rate of decel from 0 then the peak will get closer to 10G's. You can continue playing this game and second guessing it quite a bit. Overall having it survive a 10 G impact is probably pretty reasonable. You shouldn't see a lot of those, but you may likely see a couple a season.