A dog runs 150 m away from his master in straight ine in 10 seconds and then returns halfway back in one-fourth the time. Calculate its average velocity: 10 ms-1 B) 6 ms-1 C 15 ms-1 D) 21 ms-1
Answers
the dog run from his master =150m
dog run straight line 150 m in =10s
average velocity =displacement
time taken
= 150 = 15
10
answer: C. 15ms-1
Given : A dog runs 150 m away from his master in straight line in 10 seconds and then returns halfway back in one-fourth the time.
To Find : Average velocity:
A ) 10 ms-1 B) 6 ms-1 C 15 ms-1 D) 21 ms-1
Solution:
dog runs 150 m away in 10 secs
Displacement = Final position - Initial Position
Velocity = Displacement ./ Time
go away = 150 m
returns halfway back = 150/2 = 75 m
Net Distance from original position = 150 m - 75 m = 75m
Displacement = 75 m
Time in going = 10 sec
Time in return = 10/4 = 2.5 sec
Total Time = 10 + 2.5 = 12.5 secs
Velocity = 75/12.5 = 6 m/s
Average velocity = 6 m/s
Correct option is B
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