With respect to which bodies is the motion of a piece of foam plastic lying motionless

With respect to which bodies is the motion of a piece of foam plastic lying motionless on the surface of the water considered?

As you know, movement is a relative concept. This means that some object will move only for those objects relative to which it changes its location. So a piece of foam, which seems to be motionless, can move relative to the flow of water, or for example other objects that somehow move.



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