The handwriting or solutions please make it clear (readable) please thank you 1. Why is the equation PE = mgh cannot be used to get the potential energy anywhere in the universe? A. Mass is not constant on every part of the universe. B. It is only used for objects near the surface of Earth. C. Height cannot be determined. D. Acceleration is constant for every part of the universe.

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Frame of reference

In physics, a frame of reference is a coordinate system used to specify either the position or the orientation or velocity of a body. The origin of the coordinate acts as a reference point for measuring the position or relative motion of a body. The coordinate system can be a cartesian coordinate, cylindrical coordinate, or a polar coordinate.