# Objects A and B are at the origin. If object A moves to #(-3 ,1 )# and object B moves to #(-6 ,3 )# over #3 s#, what is the relative velocity of object B from the perspective of object A? Assume that all units are denominated in meters.

From A's perspective B would increase the distance from A with a speed

If we consider object A to be the origin of a system of coordinates that is moving with it, then the relative position of object B from object A's perspective is represented as the difference between the two vectors above, that is

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The relative velocity of object B from the perspective of object A is (-1 m/s, 0 m/s).

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