A cheetah is faster. The big cats can reach a speed of 112 to 120 km/hr (70 to 75 mph). Usain Bolt runs a course of 200 meters in 19.3 seconds, but that is only an average speed of 37.3 km/hr (23.1 mph). His top speed is only about 50 km/hr (30 mph).
The cheetah also has faster acceleration : 0 to 64 mph in 3 seconds, which is faster than most cars other than dragsters.
Bolt would need a head start, because he could probably continue running once the cheetah tired after about 400 meters.
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Usain Bolt broke Johnson's 200 meter world record at the Beijing Olympic Games.
Usain Bolt ran it with a 1.4 mph haedwind (against him).
He broke Johnson's WR by .02 seconds.
Usain Bolt broke his own 200m world record at the Berlin World Championships.
He smashed his own record by .11 seconds. There is no doubt now that Usain Bolt now has a faster top speed than Michael Johnson.
Usain Bolt's top speed is about 44 km/h, unfortunately I do not know Michael Johnson's top speed.
Usain Bolt is easily the fastest man alive. Michael Vick is the fast Quarterback but not the fastest man alive.
A Greyhound can run at 45 mph;Usain Bolt's speed was measured at just over 27 mph,so a Greyhound is the clear winner.