Question

An object travels 40 m in 5 seconds and then another 80 m in 5 seconds. What is the average speed of the object?
2/2
12m/s

6m/s
2m/s
0m/s​

Answer 1

Answer:

12 m/s

Explanation:

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Answer 2

Given ,

Distance traveled in first 5s = 40m

Distance traveled in second 5s = 80m

To Find :-

Average speed

Solution :-

Total distance traveled = 80m + 40m = 120m

Total time taken = 5s + 5s = 10s

Formula :-

$Average\: speed\: =\: {\dfrac{Total\: dist}{Total\: time\: taken}}$

On Inserting the values in the formula

We get ,

$Average\: speed\: =\: {\dfrac{120}{10}}$

(0 & 0 gets cancelled)

=> Average speed = 12 m/s

Therefore, Average speed is 12 m/s

Short-hands Used :-

• m = metre
• s = seconds
• Dist = distance

Extra Information :-

1. metre → metre is a SI unit of length. it is denoted by (m). It is also the fundamental unit of length and is equal to 100cm.
2. second → second is the SI unit of time. it is denoted by (s). 1 minute is equal to 60 seconds.
3. Speed → Speed is the rate of change of distance per unit time. it's SI unit is m/s. It doesn't depends upon direction. It is a scalar quantity
4. Average speed → Average speed is the ratio of total distance traveled by total time taken. it is also a scalar quantity.