Question

when a body can be in motion

Answer 1

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In physics, motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity,acceleration, time, and speed. Motion of a bodyis observed by attaching a frame of reference to an observer and measuring the change in position of the bodyrelative to that frame.

Answer 2

A body be in motion when in position changes with respect to observers.