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momentum
The product of the mass (m) and velocity (v) of a moving object, usually denoted by the letter p, so that p = mv. Like velocity, momentum is a vector. The law of conservation of momentum states that when two or more objects interact, such as when a cannon fires a shell or a rocket shoots out a fast jet of hot gas, the total vector sum of their momenta is unchanged. See also angular momentum.
Related category
• CLASSICAL MECHANICS
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