Posted by ashley on Saturday, June 11, 2011 at 10:10pm.
A student wanted to drive from Austin to san Antonio ,80 mi south of Austin on highway I35. Unfortunately he entered in the wrong direction and drove to waco100 miles north of Austin –before he noticed his error. In waco ,he turned around,drove back to Austin and continued to San Antonio . The whole trip took 5.46 h.
What was the student’s average speed during this trip? Answer in units of mph
What was the student’s average velocity during this trip? Take your positive direction to be southbound on I 35.

physics  bobpursley, Sunday, June 12, 2011 at 5:30am
distance= 80+2*100=280
speed=distance/time
veloctiy= 80/time Southbound

physics  ashley, Sunday, June 12, 2011 at 2:51pm
Would the time southbound be if I were to half 5.46? Or, I looked it up that it would take about 1 h 30 min from austin to san antonio.
I ended up taking 80mi/1.5h=53mph.
If that's not a good way to go about it, how do I figure out the time southbound?

physics  ashley, Sunday, June 12, 2011 at 10:23pm
I also tried 180mi/51.3(t)=3.50877193h. Then i took 80mi/that answer to get 22.8mph. Is that the right approach?
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