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August 20, 2014

August 20, 2014

Posted by **Lindsay** on Monday, September 10, 2007 at 4:05pm.

A. How long does the total trip last?

B. What is the average velocity for the total trip?

I know this problem uses the average velocity equation, where the average velocity equals the change in position over the change in time, but I'm unsure which numbers I need to plug in. Please help!

- Physics -
**drwls**, Monday, September 10, 2007 at 4:23pmA. Add up the times spent travelling and at the intermediate 24 minute (0.40 hour) stop. The 280 km travled at 88 km/hr required 280/88 = 3.18 hours, for example.

Total time = 3.18 + 0.60 + ___ = hrs ?

B. For average velocity, divided the total distance traveled by the total time required (from part A). Both times spent travelling were in the same direction (South), ao you don't have to worry about adding vectors

- Physics -
**Lindsay**, Monday, September 10, 2007 at 4:32pmSo for part A, I got 6.38 hours because I added 3.18, 2.8 (210 km/75) and .40 together. Is this correct?

- Physics -
**drwls**, Monday, September 10, 2007 at 5:47pmYes, if the answer is in hours

- Physics -
**Lindsay**, Monday, September 10, 2007 at 7:36pmOk good. Then, for part B...I got 76.8 for the average velocity.

...I sure hope this is correct...!

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