Which has a greater momentum, an airplane parked in hangar or a car going down the hill?

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If an object is moving in any reference frame, then it has momentum in that frame. It is important to note that momentum is frame dependent. That is, the same object may have a certain momentum in one frame of reference, but a different amount in another frame.

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The amount of momentum that an object has depends on two physical quantities: the mass and the velocity of the moving object in the frame of reference. In physics, the symbol for momentum is usually denoted by a small bold p (bold because it is a vector); so this can be written:

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p= mv

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where:

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p is the momentum
m is the mass
v the velocity

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The car

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The car?

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momentum is mass multiplied by velocity (mv) so it is the car as it has a value for v.