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Momentum in different frames of reference

The magnitude of momentum is strictly relative to the frame of reference:

A car at high speed hitting a stationary wall will be seriously damaged. A car hitting another car going slightly slower in the same direction will be damaged only slightly.

A man walking in the aisle of a plane while flying will have a very small momentum relative to other passengers. However, his momentum is large relative to objects standing on the Earth.

These NASA planes land in formation. They have zero momentum relative to each other but massive momentum relative to observers on the ground.
These NASA planes land in formation. They have zero momentum relative to each other but massive momentum relative to observers on the ground.