Which quantity, speed or velocity gives the direction of motion of a body?

Explanation

To determine which quantity, speed or velocity, gives the direction of motion of a body, we can analyze the definitions and characteristics of both quantities.

### Step-by-Step Solution:

1. **Define Speed**:
- Speed is defined as the distance traveled by an object per unit of time.
- Mathematically, it is expressed as:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
- Speed is a scalar quantity, which means it has only magnitude (how fast something is moving) and no direction.

2. **Define Velocity**:
- Velocity is defined as the displacement (change in position) of an object per unit of time.
- Mathematically, it is expressed as:
\[ \text{Velocity} = \frac{\text{Displacement}}{\text{Time}} \]
- Velocity is a vector quantity, which means it has both magnitude (how fast something is moving) and direction (the way in which it is moving).

3. **Comparison of Speed and Velocity**:
- Since speed only provides information about how fast an object is moving without any indication of the direction, it cannot tell us the direction of motion.
- In contrast, velocity not only tells us how fast an object is moving but also in which direction it is moving.

4. **Conclusion**:
- Therefore, the quantity that gives the direction of motion of a body is **velocity**.

### Final Answer:
**Velocity gives the direction of motion of a body.**

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