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October 21, 2014

October 21, 2014

Posted by **Anonymous** on Thursday, August 7, 2014 at 2:56am.

- physics -
**Damon**, Thursday, August 7, 2014 at 3:01amsince the total displacement vector is zero the average speed is zero.

let i be unit vector from point A to point B

velocity outbound = 40 i

velocity back = -60 i

(40 - 60)/2 = -10

- physics -
**Steve**, Thursday, August 7, 2014 at 5:58amThe average velocity is zero, but the speed is not.

The total distance covered is 2d. The total time taken is

d/40 + d/60 = 5d/120

So, the average speed is 2d/(5d/120) = 48 km/hr

- physics whoops -
**Damon**, Thursday, August 7, 2014 at 10:12amWhoops, sorry, Steve is right.

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