Question

a person travels along a straight road for the first half lenth with a velocity of 20 m/s and the second half length with a velocity of 30 m/s.find the average velocity?​

Answer 1

Answer:

let the half lengths be x each

thus time taken for first length, t1 = x/20

time taken for second length, t2 = x/30

thus average velocity = 2x/(t1+t2) = 24 m/s

Explanation:

follow me

Answer 2

Answer:

24m/s

Explanation:

let the distance covered be 'd' m

for the half of the length, distance=d/2

therefore the time taken for the 1st half = (d/2)/20=d/40 s

now the time taken for the 2nd half= (d/2)/30=d/60 s

now as we know that avg velocity= total displacement / total time taken

therefore,

avg velocity= d/(d/40)+(d/60)=d/d/24=24m/s