Which of the following physical quantities is different from others?

Options

A. Speed
B. Distance
C. Energy
D. Average velocity

Answer

To determine which physical quantity is different from the others among Speed, Distance, Energy, and Average Velocity, we will analyze each quantity based on whether it is a scalar or vector quantity.

### Step-by-Step Solution:

1. **Identify the Physical Quantities**:
- Speed
- Distance
- Energy
- Average Velocity

2. **Classify Each Quantity**:
- **Speed**: This is defined as the distance traveled per unit time. Speed is a scalar quantity because it only has magnitude (e.g., 60 km/h) and no direction.
- **Distance**: This refers to the total path length traveled by an object. Distance is also a scalar quantity as it only has magnitude (e.g., 100 meters) and no direction.
- **Energy**: Energy is defined as the capacity to do work. It is a scalar quantity as well, having only magnitude (e.g., 50 Joules) and no direction.
- **Average Velocity**: This is defined as the total displacement divided by the total time taken. Displacement is a vector quantity because it has both magnitude and direction (e.g., 30 meters to the north). Therefore, average velocity is also a vector quantity.

3. **Compare the Classifications**:
- Speed: Scalar
- Distance: Scalar
- Energy: Scalar
- Average Velocity: Vector

4. **Conclusion**:
- The only quantity that is different from the others is **Average Velocity**, as it is a vector quantity, while Speed, Distance, and Energy are all scalar quantities.

### Final Answer:
The physical quantity that is different from the others is **Average Velocity**.