Wikipedia:
Some debris may survive to reach the surface. Of the 26 pieces expected to survive reentry and strike the surface, the estimated mass of the largest piece is 158.3 kg (349 lb), possibly reaching the surface at a velocity of 44 metres per second (140 ft/s) (98 miles/hour). Smaller pieces are expected to strike the surface at up to 107 m/s (350 ft/s).