Class 11 NEET Physics Motion in a Straight Line Questions

If The half distance (x) covered with the speed v1 in 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=xt2
t2=‌

x

v2

Average Velocity =‌

‌ Total distance ‌

‌ Total time ‌

Total time =t1+t2=‌

x

v1

+‌

x

v2

=‌

(v2*x+v1*x)

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 v1*v2 )

V=‌

2v1v2

(v1+v2)