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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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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
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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. Tags average, velocity Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post poopeyey2 Advanced Statistics 2 October 26th, 2017 06:34 PM ashlegen Algebra 4 February 17th, 2014 01:10 AM gorgekiter Calculus 3 October 20th, 2013 05:54 PM sayzteff Physics 0 November 24th, 2012 07:13 AM mathman2 Calculus 10 October 19th, 2009 04:15 PM

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