Physics, asked by rajak9330, 22 days ago

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

Answered by lonelyprince14
1

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

Answered by amitnrw
0

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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