What type of quantity is mass when it is measured as 5 kilograms?

Mass is a scalar quantity. Scalar quantities have magnitude (amount) only and no direction. In the case of mass, whether an object is stationary or in motion, its mass remains the same, and it is measured in kilograms (kg). Vector quantities, on the other hand, have both magnitude and direction (e.g., force, velocity). Mass does not have a direction associated with it, so it is classified as a scalar quantity. Therefore, the correct answer is A) Scalar.