Which of the following is not a vector quantity?

• A. $\text{Acceleration}$
• B. $\text{Displacement}$
• C. $\text{Speed}$
• D. $\text{Velocity}$

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the difference between scalar and vector quantities. Scalars have only magnitude, while vectors have both magnitude and direction.
2. Step 2: Identify the nature of each quantity given: Acceleration, Displacement, Speed, and Velocity.
3. Step 3: Recall that Acceleration is a vector because it describes the rate of change of velocity, which includes direction.
4. Step 4: Displacement is a vector because it represents the change in position with a specific direction.
5. Step 5: Speed is a scalar quantity because it only measures how fast an object is moving, without any direction, unlike Velocity which is a vector.