A whole lot. It depends on how fast it is going. See http://measurespeed.com/deceleration-calculator.php for a quick-and-dirty overview. Gravity accelerates at at 9.8m/s², so if it fell for one second before impacting the ground, and took (for instance) 0.05 seconds to deform before coming to a halt, it'd have experienced 8.91 Gs of shock.