Question

A moving partical object traveled half its path with speed v1 and rest half with speed v2 find the average speed for the entire journey with solution

Answer 1

Hi..

Let, the total distance covered by the particle during the complete journey is 2x.

If The half distance (x) covered with the speed v1 in t1 time.

Using formula of speed, v1=x/t1

so, t1= x/v1

And another half distance (x), covered with speed v2 in time t2.

so, v2=x/t2

t2=x/v2

AVERAGE VELOCITY = Total distance /Total time

Total time= t1+t2 = x/v1 + x/v2

=(v2x+v1x)/v1v2

Total distance = x+x=2x

On putting the values of total distance and total time in the formula of average speed, we get

Average speed= 2x /(v2x+v1x / v1v2)

= 2v1v2 /(v1+v2)..

Hope this helps u!!