Question

An object moves with a uniform speed of 10m/s for 5s and then with uniform speed of 5m/s for 10s .find its average speed

Answer 1

1st case:-
10 m/s for 5 seconds
s = vt
= 10×5
= 50m
2nd case:-
5 m/s for 10 seconds
s = vt
= 5×10
= 50 m
Average velocity = total distance/total time
= 50+50/5+10
= 100/15
= 6.66 m/s

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Answer 2

We know that AVERAGE VELOCITY ( say υ ) is given by :
υ = (total displacement)/(total time)
____
#Total displacement

object moves with a uniform speed of 10m/s for 5s , then displacement (S) covered ;
S = 10×5 = 50m

object moves with a uniform speed of 5m/s for 10s, then displacement (s) covered ;
s = 5× 10 = 50m

Total displacement covered= 50+50 = 100m
And Total time taken = 5+10 = 15s

υ = 100/15 = 20/3 m/s
_______
hope it helps !