If the velocity of an object increases and its mass triples how much does the momentum increase by?

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Momentum of an object is related to its mass, m and velocity, v. The product of mass and velocity of an object is termed as its momentum. If any of these quantities (mass or velocity or both) changes, object's momentum will change. 

In the given case, the mass triples, i.e....

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Momentum of an object is related to its mass, m and velocity, v. The product of mass and velocity of an object is termed as its momentum. If any of these quantities (mass or velocity or both) changes, object's momentum will change. 

In the given case, the mass triples, i.e. new mass is 3m. Nothing is mentioned about its velocity (except that it increases). Let us assume that it also triples, i.e. new velocity is 3v. Thus, the new momentum of the body is given by 3m x 3v = 9 mv. That is the momentum changes by a factor of 9, the final momentum is 9 times the original momentum. Similarly, any other change in mass or velocity or both can be used to determine the change in momentum.

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