science
Grade-7
Easy
Question
An object covers the first 30 m of the journey in 5 seconds and the next 30 m in 3 seconds. What is the average speed of the object?
- 8.6 m/s
- 7.5 m/s
- 5.8 m/s
- 8 m/s
Hint:
Average speed = total distance covered by an object / time taken by an object.
The correct answer is: 7.5 m/s
- Given:
- Distance covered by an object in first half = S1 = 30m
- Time covered by an object in first half = t1 = 5 seconds
- Distance covered by an object in second half = S2 = 30m
- Time covered by an object in second half = t2 = 3 seconds
Formula:
Average speed = total distance / time taken
Average speed = 
ms-1
Average speed = 
ms-1
Average speed = 
= 7.5 ms-1
ANSWER: 7.5 ms-1
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