A train moving at an essentially constant speed of 60 mile/h moves eastward for 40 min, then in a direction 45º east of north for 20 min, and finally westward for
50 min. What is the average velocity of the train during this run ?
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Ans. 8 mile/h at an angle 16.5º east of north.
〈 v 〉 = 50 cm/sec. 
= 32 cm/sec
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