What affects speed and what does speed mean?

Answer:
Speed is the rate of change of something, or distance over time. If someone went 100 miles in two hours, they went fifty miles an hour (100 / 2). Speed is affected by one thing: force. Something either forces it to move faster or slow down. If no force is affecting it, it remains the same.
Contributor: Kris
First answer by Kris Osterhout. Last edit by Kris Osterhout. Contributor trust: 2 [recommend contributor recommended]. Question popularity: 3 [recommend question].