Let’s solve each part step by step.
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Q.3: Write unit and unit symbol for the following concepts.
We need to fill in the table with the standard SI units (or commonly used units) and their symbols for Distance, Time taken, and Speed.
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Distance: The standard unit is meter. Symbol: m
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Time taken: The standard unit is second. Symbol: s
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Speed: Speed = distance / time → so unit is meter per second. Symbol: m/s
So the completed table:
| Concept | Unit | Unit Symbol |
|-------------|------------------|-------------|
| Distance | meter | m |
| Time taken | second | s |
| Speed | meter per second | m/s |
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Q.4: Which bicycle has the greatest speed?
We are given 4 bicycles with distance traveled and time taken. We must calculate speed for each using:
>
Speed = Distance ÷ Time
Let’s compute each one carefully.
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a)
Distance = 200 m
Time = 50 s
Speed = 200 ÷ 50 =
4 m/s
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b)
Distance = 400 m
Time = 80 s
Speed = 400 ÷ 80 =
5 m/s
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c)
Distance = 120 m
Time = 40 s
Speed = 120 ÷ 40 =
3 m/s
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d)
Distance = 300 m
Time = 50 s
Speed = 300 ÷ 50 =
6 m/s
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Now compare all speeds:
- a) 4 m/s
- b) 5 m/s
- c) 3 m/s
- d) 6 m/s ←
highest
✔ So, bicycle
d has the greatest speed.
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Final Answer:
Q.3:
Distance → meter, m
Time taken → second, s
Speed → meter per second, m/s
Q.4: d
Parent Tip: Review the logic above to help your child master the concept of calculating speed worksheet middle school.
