On your way to class you are walking North up the oval. From Dale Hall you walk

Question

On your way to class you are walking North up the oval. From Dale Hall you walk 180 m towards Nielsen Hall when you meet a friend heading the other direction. You have to ask him a question so you turn around and walk back South talking with him for 75 m. Then you turn back around and hurry on to class. If your speed is a constant 0.95 m/s as you are walking (both directions), what is your average velocity from the time you leave Dale Hall to the time you leave your friend to go to class? (Let North be the positive direction.)
the answer is .39
can you tell me how

Explanation / Answer

average velocity = displacement/time time = distance/speed = 180+75/0.95 = 255/0.95 = 268.42 sec avg velocity = 180-75) /368.42 = 0.391 m/s

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