When is it necessary to use vectors?

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Question

(B) In one-dimensional motion,physical quantities like displacement,velocity,and acceleration can be described using $(+)$ and $(-)$ signs to indicate

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To describe motion in two or three dimensions.

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(B) In one-dimensional motion,physical quantities like displacement,velocity,and acceleration can be described using $(+)$ and $(-)$ signs to indicate direction,as there are only two possible directions along a straight line.However,when an object moves in two dimensions (a plane) or three dimensions (space),the direction is no longer restricted to just two possibilities. In such cases,we must use vectors to fully describe these physical quantities,as vectors account for both magnitude and direction in any arbitrary orientation.

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