A car moves at the speed of 72 km/hr. What is the speed of the car in meters per second ?

Options

A. (a) 15 meters/sec
B. (b) 18 meters/sec
C. (c) 20 meters/sec
D. (d) 26 meters/sec

Answer

To convert the speed of the car from kilometers per hour (km/hr) to meters per second (m/s), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the conversion factors**:
- 1 kilometer (km) = 1000 meters (m)
- 1 hour (hr) = 3600 seconds (s)

2. **Write down the speed given**:
- The speed of the car is 72 km/hr.

3. **Convert kilometers to meters**:
- To convert kilometers to meters, we multiply by 1000:
\[ 72 \text{ km/hr} = 72 \times 1000 \text{ m/hr} \]
\[ = 72000 \text{ m/hr} \]

4. **Convert hours to seconds**:
- To convert hours to seconds, we divide by 3600 (since there are 3600 seconds in an hour):
\[ 72000 \text{ m/hr} = \frac{72000}{3600} \text{ m/s} \]

5. **Calculate the final speed in m/s**:
- Now, perform the division:
\[ \frac{72000}{3600} = 20 \text{ m/s} \]

### Final Answer:
The speed of the car in meters per second is **20 m/s**.

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