A motorcycle and a truck are both moving in the same direction in adjacent lanes on a highway. At a particular instant, the speed of motorcycle is four times as large as the speed of truck v. At that instant, motorcycle is accelerating forward while the truck is moving at a constant velocity. Which one of the following statements best describes which vehicle has a larger momentum at that instant?

Momentum is mass times velocity, and the mass is not given. However, the truck would have a larger momentum if the mass of the truck were more than four times that of the motorcycle. Acceleration does not play a part in determining the momentum at a particular instant.

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