Question

A train travels with speed of 60 km per hour from station a to station be and then come back with a speed 80 km per hour from station be two station a find the average speed and average velocity of the train

Answer 1

To find Average speed and Average velocity
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Average speed = (V1+V2)/2

=(60+80)/2

=140/2= 70 km/hr




Hence if we talking about the velocity ,
the velocity of going A to B is 60km/hr

But here are situation comes
then the velocity from coming to B to A will be = ( -80 )km/hr

Because direction is opposite. Displacement is opposite, then displacement from B to A will be negative
so velocity will also be negative .

Average velocity = {60+ (-80)}/2

= -20/2 km/hr

= -10 km/hr