A train travels with a speed of 60 kmh-1 from station a to station b and then comes back with a speed of 80 kmh-1 from station b to station
a. Find :average speed 2. The average velocity of train
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v1=60km/hr
v2=80km/hr
average velocity= 2×v1×v2 / v1 + v2
=2×4800/140
=68.57m/s
average speed=60+80/2
=140/2
=70km/hr
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