A metro train moves 140km/hr east for an hour and then moves 120km/hr west for an...
A metro train moves 140km/hr east for an hour and then moves 120km/hr west for an hour. describe how you will find the average velocity. What is the displacement in this problem and what is the average velocity in this problem?
Homework Answers
If we assume that the unit vector along the east direction is 'i' , then
displacement of the train in its 2 hours journey, d = (140X1)i - (120X1)i =20 i km
average velocity, v = d / t [ where, t = 2 hours] = (20/2) i =10 i km/h
i.e average velocity = 10 km/h in the east direction (Ans)
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