Answer:
Estimates of
dinosaur speeds vary because several different methods
are used to calculate them. One recent estimate
suggests that an average person might have been able
to to outrun an adult Tyrannosaurus (although you
probably would not volunteer to try). The two basic
approaches for estimating dinosaur speed are comparing
to recorded speeds of modern animals of similar body
size and build, and measuring distances between fossil
footprints in a trackway and using these distances to
calculate estimated speed. Walking-speed estimates for
medium-sized bipedal (two-legged) dinosaurs vary from
4 kph to 6 kph, and peak running-speed estimates vary
from 37 kph to 88 kph. The highest figure (88.6 kph)
is the same as the peak speed of the currently fastest
land animals, such as the North American pronghorn
"antelope" (Antilocapra americana), and very probably
is too high.
Speed comparison of some ancient and modern animals
