Question

An object travels 20m in 5 sec and then another 40m in 5 sec. What is the average speed of the object
a) 12m/s b)6m/s c) 2m/s d) 0m/s​

Answer 1

Answer:

6m/s

Explanation:

Average speed = Total distance/total time

= 20+40/5+5

=60/10

= 6m/s

Answer 2

The average speed of the object = 6 m/s

Given :

An object travels 20m in 5 sec and then another 40m in 5 sec

To find :

The average speed of the object

a) 12 m/s

b) 6 m/s

c) 2 m/s

d) 0 m/s

Solution :

Step 1 of 2 :

Calculate total distance travelled and total time taken

Here it is given that the object travels 20m in 5 sec and then another 40m in 5 sec.

Total distance travelled

= 20 m + 40 m

= 60 m

Total time taken

= 5 sec + 5 sec

= 10 sec

Step 2 of 2 :

Calculate average speed of the object

The average speed of the object

$\displaystyle \sf{ = \frac{Total \: distance \: travelled }{Total \: time \: taken} }$

$\displaystyle \sf{ = \frac{60}{10} } \: \: m/s$

$\displaystyle \sf{ = 6 \: \:m/s }$

Hence the correct option is b) 6 m/s

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