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July 22, 2014

July 22, 2014

Posted by **DESMOND** on Tuesday, May 1, 2012 at 2:41am.

A car moves 26 km due east then 14 km due north. It then turns along a path running north-east with 15 km, then 17 km due west. If the time for the entire journey is 2 hrs, Find;

(a) the car’s average speed in m/s

(b) the car’s average velocity in km/h

- ENG102 -
**visoth**, Tuesday, May 1, 2012 at 2:47amaverage speed formula is total distance divided by total time

average velocity formula is total displacement over time

the two may seem like the same thing but they arent

velocity is a vector so direction has to be taken into account (for example say you start at an inital position and move ;eft 1 meter and then move right one meter, your total distance is 2 meter but your total displacement is zero because you are right back where you started

- ENG102 -
**visoth**, Tuesday, May 1, 2012 at 2:48amfor your speed just add your total distance traveled (26 + 14 +15 + 17) and divide that by 2 hours

- ENG102 -
**visoth**, Tuesday, May 1, 2012 at 2:50amthe velocity for this is a little trickier you have to figure out your final position and how far you are from your starting point and divide that by the time

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