A physical quantity which has a direction: A) Must be a vector B) May be a vector C) Must be a scalar D) Must be zero
A) Must be a vector.
A physical quantity that has a direction must be represented as a vector. Vectors have both magnitude (a numerical value) and direction, which allows them to describe quantities such as displacement, velocity, force, and momentum, among others. Examples of vector quantities include velocity (speed with a specific direction), force (push or pull with a specific direction), and displacement (change in position with a specific direction). Scalars, on the other hand, only have magnitude and no specific direction associated with them. Examples of scalar quantities include mass, temperature, and time. Therefore, the correct answer is A) Must be a vector.
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