Which of the following quantities is a vector?

• A. $\mathrm{Distance}$
• B. $\mathrm{Displacement}$
• C. $\mathrm{Mass}$
• D. $\mathrm{Speed}$

Answer: (B)

Verified step by step guidance

1. Understand the difference between scalar and vector quantities. Scalars have only magnitude, while vectors have both magnitude and direction.
2. Analyze each quantity given: Distance is a scalar because it only measures how much ground is covered, without direction.
3. Displacement is a vector because it measures the change in position from the starting point to the ending point, including direction.
4. Mass is a scalar since it only represents the amount of matter in an object, with no direction involved.
5. Speed is a scalar because it indicates how fast an object is moving, but not the direction of motion.