The small rubber ball was moving quickly as well as a huge metal ball is now at rest. The massive metal ball starts to roll more slowly once they meet, slowing the small rubber ball's speed.
Momentum is characterized as the intensity of a body's motion. As momentum depends on both velocity as well as the direction of a body's motion, it is quantified by "mass velocity". Because velocity is just a vector and mass is a scalar, momentum is a vector.
Momentum can be viewed as a body's "power" while it is moving, or the amount of force it can exert on another body.
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