How do you calculate speed and momentum?

Answer 1

Speed is defined as distance travelled per unit of time (for example, miles per hour, or kilometers per hour, feet per second, etc.). Momentum is mass times velocity. Velocity is not exactly the same thing as speed; it is the speed plus the direction. That way, two objects that are moving in the opposite direction have opposite momentum, and when the collide, the momentum can cancel (if they don't bounce apart) rather than adding up to twice the momentum. Actual calculations of these sorts of problems involves calculus, because speed and momentum can change continuously, so you need a mathematical system that is designed to deal with that kind of change.

Answer 2

Speed is calculated by dividing the distance traveled by the time taken. Momentum is calculated by multiplying an object's mass by its velocity. The formulas are: speed = distance/time and momentum = mass x velocity.