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Measurement of Time and Motion — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceMeasurement of Time and Motion5 Marks
Question
Define average speed and explain how it is calculated.
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Answer

→ Average speed is the total distance an object travels divided by the total time it takes to travel that distance. It tells you how fast an object moves on average over its entire journey, even if its speed changes along the way.
→ To calculate average speed,
→ Average Speed $=\frac{\text { Total Distance Covered }}{\text { Total Time Taken }}$
To Calculate Average Speed
→ First, determine the total distance the object has traveled.
→ Next, find the total time it took to travel that distance.
Example: Suppose a car travels 120 kilometers in the first 2 hours and then 80 kilometers in the next 3 hours.
→ Total Distance = 120 km + 80 km = 200 km
→ Total Time = 2 hours + 3 hours = 5 hours
→ Use the formula for average speed:
→Average Speed $=\frac{200 km}{5 h}=40 km / h$
→ So, the average speed of the car is :40/km/h

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