Question 1 of 11intermediate🔧 ApplyNumerical3 marks

Calculate the speed of a car that travels 150 metres in 10 seconds. Express your answer in km/h.

Correct Answer

Speed is calculated as total distance covered divided by total time taken. The SI unit of speed is m/s, but it can also be expressed in km/h.

To convert m/s to km/h, multiply by 3.6 (or 3600/1000).

Step 1: Calculate speed in m/s using the formula: Speed = Distance/Time = 150 m / 10 s = 15 m/s.

Step 2: Convert m/s to km/h: 15 m/s × (3600 s/1 h) × (1 km/1000 m) = 15×3.615 \times 3.6 = 54 km/h.

Final Answer: The speed of the car is 54 km/h.

Exercise: Let Us Enhance Our Learning | Q: 1 | (Page Page 14)
For More Understanding

Explanation

The chapter explains that speed is calculated as total distance covered divided by total time taken. The SI unit of speed is m/s, but it can also be expressed in km/h. To convert m/s to km/h, multiply by 3.6 (or 3600/1000).

Solution Steps

  1. Step 1: Calculate speed in m/s using formula: Speed = Distance/Time = 150 m / 10 s = 15 m/s

  2. Step 2: Convert m/s to km/h: 15 m/s × (3600 s/1 h) × (1 km/1000 m) = 15×3.615 \times 3.6 = 54 km/h

  3. Step 3: Final answer: Speed = 54 km/h

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