Answer:
Explanation:
Given that, an object moves 20 metre in 4 seconds.
So, distance (d1) = 20 m and time (t1) = 4 sec
Also given that, then object travels in 20 metre in 2 seconds.
Now, distance (d2) = 20 m and time (t2) = 2 sec
We have to find the average speed of the object.
Average speed = (Total distance)/(Total time)
Total distance travelled by an object = d1 + d2
= (20 + 20)m
= 40 m
Total time taken by an object = t1 + t2
= (4 + 2) sec
= 6 sec
Average speed = 40/6 = 6.67 m/s
Therefore, the average speed of the object is 6.67 m/s.