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Average speed of a vehicle is a scalar quantity because it only has magnitude and not direction. It is calculated by dividing the total distance traveled by the total time taken, without considering the direction of motion.
scalar
Scalar quantities are physical quantities that have only magnitude and no direction. Examples include mass, temperature, speed, and volume. These quantities are described fully by their magnitude alone.
Length is a scalar quantity. By definition, a vector quantity has both magnitude (ie. length) and direction. Length does not have direction, so it is not a vector. Length is a scalar quantity. Length is a scalar quantity. yes
Hours is a scalar quantity, as it only represents the magnitude of time elapsed and does not have a direction associated with it.
The potential gradient is a vector quantity. It represents the rate of change of the scalar electric potential with respect to position in space.