Question

An object travels a distance of 18m at a speed of 6m/s and then another 18m at a speed of 2m/s. What is the average speed of the object?

Answer 1

Answer:

3m/s

Explanation:

For the first case: d=18m, s=6m/s

By s1=d/t

t1=d/s1

t1=18/6

t1=3sec

For second case:

d/s2=t2

t2=18/2

t2= 9sec

Average speed= Total distance(2d)/Total time(t1+t2)

=2(18)/(3+9)

=36/12

=3m/s

Therefore, average speed of object is 3m/s