Question

An observer at point A notices that an object at point B is stationary. If it is to be assumed that the object at B is under uniform motion, what assumptions can be made about the nature of the observers at A?

Answer 1

For the observer at A, the object at B is stationary. Since we are to assume that the object at point B is under unifrom motion, this would mean that the observer at A is also under unifrom motion, while moving alondside the object B.