bongey writes: T-Rex would have a hard time even catching an average human running, much less Usain Bolt or Jeeps, without shattering their legs into pieces. New research based on simulations that include the load on the bones show that T-Rex would have a hard time running faster than 12 miles per hour (5.4 meters per second) without bones breaking. The new research correlates to speeds calculated from adolescence sized T-Rex dinosaur footprints in 2016, which showed walking speeds to be only 2-5mph, and estimated running speeds 11-18 mph. Gizmodo notes that while T. rex was unable to pursue its prey at high speeds, high speed is a relative term. "For reference, typical humans can sprint anywhere between eight to 15 miles per hour (elite athletes can exceed 20 mph). So to outrun a T. rex, many animals -- or fictional humans -- would still have to run like hell."
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