Homework Help: physics

Posted by Matt on Wednesday, November 14, 2012 at 4:38pm.

a man drives with an average speed of 25 mph for 20 minutes. he rests at his destination for 1 hour and then returns home with an average speed for this leg of the trip of 15 mph

A) what is his average speed for the round trip

B) What is his average velocity for the round trip

physics - Steve, Wednesday, November 14, 2012 at 5:00pm
distance one way = 25mi/hr * 1/3 hr = 25/3 mi

total distance = 50/3 mi
total time = 1/3 +1 + (25/3)/15 = 17/9 hr

avg speed = 50/3 mi / 17/9 hr = 150/17 = 8.82 mi/hr

avg velocity = 0, since he traveled no net distance.

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