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Conservation of Momentum: Masses and Speeds
The momentum p is calculated as mass * speed. The formula for the above calculation is:
Example: a white billiard ball with a weight of 180 grams hits another ball with a weight of 170 grams at a speed of 15 km/h. When the white ball completely releases its momentum, the other ball then has a speed of 15.9 km/h. If the cue ball is still moving at 5 km/h after the collision, the speed of the other ball is 10.6 km/h.
Physics commonly uses SI units. Here is a calculator to convert units.