The relative motion of a person riding in a car has been stationary with car, uniform constant with road, and sun.
The motion has been defined as the change in position of an object with respect to another.
The relative motion has been observed by considering an object at rest and assuming the displacement with the another.
The relative motion has been assessed from car, thus car has been assumed at rest.
Thus, the relative motion of a person riding in a car has been stationary with car, uniform constant with road, and sun.
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