Classify the following measures as scalars and vectors :
30 km/h.

Answer

To classify the measure 30 km/h as a scalar or a vector, we can follow these steps:

### Step 1: Understand the Definitions
- **Vector**: A quantity that has both magnitude and direction.
- **Scalar**: A quantity that has only magnitude and no direction.

### Step 2: Analyze the Given Measure
- The measure provided is **30 km/h**.

### Step 3: Identify the Components
- **Magnitude**: The number **30** indicates the size or amount.
- **Unit**: The unit **km/h** (kilometers per hour) indicates a rate of distance over time.

### Step 4: Determine the Direction
- In the measure **30 km/h**, there is no specified direction. It simply indicates a speed without stating whether it is moving north, south, east, or west.

### Step 5: Classify the Measure
- Since the measure has a magnitude (30) but lacks a direction, it does not meet the criteria for a vector.
- Therefore, **30 km/h** is classified as a **scalar quantity**.

### Final Answer
- **30 km/h is a scalar quantity.**

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