Which of the following is a scalar?

Options

A. Displacement
B. Kinetic energy
C. Couple
D. Momentum

Answer

To determine which of the following is a scalar quantity, we need to understand the definitions of scalar and vector quantities.

### Step-by-Step Solution:

1. **Understand Scalar and Vector Quantities**:
- **Scalar Quantity**: A quantity that has only magnitude and no direction. Examples include mass, temperature, energy, and distance.
- **Vector Quantity**: A quantity that has both magnitude and direction. Examples include force, velocity, displacement, and acceleration.

2. **Identify the Options**:
- Let's assume the options given in the question are:
1. Displacement
2. Kinetic Energy
3. Couple
4. Momentum

3. **Analyze Each Option**:
- **Displacement**: This is a vector quantity because it has both magnitude and direction (e.g., 5 meters east).
- **Kinetic Energy**: This is a scalar quantity because it only has magnitude (e.g., 50 joules) and no direction.
- **Couple**: This is also a vector quantity as it involves forces acting at a distance and has a specific direction.
- **Momentum**: This is a vector quantity as it is the product of mass (scalar) and velocity (vector), thus it has direction.

4. **Conclusion**:
- Among the options provided, the only scalar quantity is **Kinetic Energy**.

### Final Answer:
The scalar quantity from the given options is **Kinetic Energy**.