First slide
Average Velocity
Question

A person travelling in a straight line moves with a constant velocity v1 for certain distance ‘x’ and with a constant velocity v2 for next equal distance. The average velocity v is given by the relation

Easy
Solution

 As t1=xv1 and t2=xv2

 v=x+xt1+t2

=2xxv1+xv2=2v1v2v1+v2

 2v=1v1+1v2

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