Cheetah.
20 mph
No, unless you are threatening it. The old "black cat running in front of you means that you will have bad luck" thing is superstition.
A big fat cat!
Panther
The melanistic form of the leopard, commonly known as the black panther, is an example of a large black member of the cat family.
Puma has several running shoes that are available in black. Check out the Nightfall crosstrainer or the Drift Cat model. Both are black with color trim options.
The Cheetah is the fastest recorded "big cat" topping 75 mph.
A cheetah meets your description.
panther
leopard
a panther
A large black cat may be either a melanistic jaguar or a melanistic leopard and are collectively known as black panthers.