How fast does a cheetah run when it is catching its prey?
In general, the speed of a hunting cheetah averages 64 km/h (40 mph) during a chase, interspersed with a few short bursts when the speed may vary between 104 and 120 km/h (65 and 75 mph). The most reliable measurement of the typical speed during a short chase is 112 km/h (70 mph).
The tail helps the Cheetah keep it's balance. Plus, the long strong tail acts as a rudder, helping the animal steer while running at top speeds. It makes the sharp turns and quick switchbacks possible without the Cheetah losing any speed, making it capable of catching very agile prey. For more details, please see the sites listed below.
The cheetah is the fastest land animal in the world. They can outrun any animal. In the grasslands, there are tall grasses. The cheetah can hide in those grasses and when the prey is near, they can chase it. So basically, the cheetah is well suited for life in the grasslands because they can hide in the tall grasses and they can run fast.