momentum

mo|men|tum /moʊm'entəm/
1 [N-UNCOUNT]
If a process or movement gains momentum, it keeps developing or happening more quickly and keeps becoming less likely to stop.
This campaign is really gaining momentum...
= impetus
2 [N-UNCOUNT]
In physics, momentum is the mass of a moving object multiplied by its speed in a particular direction. (TECHNICAL)

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