Question

why do we need a reference point (in 1 mark question ​

Answer 1

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a reference points in physics is a point in space,regardless of the type of geometry that you are using that stays still and does not move.from this point the behaviour of an object moving through that space can be determined.

in three dimensional space, the reference point is usually considered to be the zero point where all 3 axes are 0

are fixed point with respect to which a body changes its position is called reference point or origins