My Math Forum Average velocity

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 May 11th, 2019, 10:03 AM #1 Member   Joined: Feb 2018 From: Iran Posts: 52 Thanks: 3 Average velocity I found the average velocity this way x0=120 X=x0+vt X=120+0.5*80 X=160 Vav= 160÷5=32 But answer is not correct according to my book why?
 May 11th, 2019, 11:08 AM #2 Math Team     Joined: Jul 2011 From: Texas Posts: 3,002 Thanks: 1588 since travel is in one direction only, average velocity = average speed average speed = (total distance traveled)/(total travel time) $|\bar{v}| = \dfrac{120 \,km + 80 \, km}{5 \,hrs} = 40 \, km/hr$ Thanks from Elize
May 11th, 2019, 08:02 PM   #3
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Joined: Feb 2018
From: Iran

Posts: 52
Thanks: 3

Quote:
 Originally Posted by skeeter since travel is in one direction only, average velocity = average speed average speed = (total distance traveled)/(total travel time) $|\bar{v}| = \dfrac{120 \,km + 80 \, km}{5 \,hrs} = 40 \, km/hr$
I am so sorry I thought that 80km is 80 km/h now I got it thanks

Last edited by Elize; May 11th, 2019 at 08:31 PM.

May 11th, 2019, 08:28 PM   #4
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Joined: Oct 2018
From: USA

Posts: 88
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Math Focus: Algebraic Geometry
Quote:
 Originally Posted by Elize How did you find 80?
It's given in the problem, $120$ km in the first 2 hours, $0$ km for 2.5 hours and $80$ km in 0.5 hours. This gives a total distance of $120+0+80$ as skeeter says.

Last edited by skipjack; May 11th, 2019 at 11:02 PM.

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