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1.
A typo for momentum, or the product of mass and velocity of an object. In physics, this vector quantity is represented by the letter p for some reason, hence the tendency to make such a typo.
The reason it much harder to stop a train than it is to stop a car is due to the former's very high mass and velocity, giving it greater pomentum.
by JohnBlaze420 April 02, 2011
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