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May 11th, 2019, 10:03 AM   #1
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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?
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May 11th, 2019, 11:08 AM   #2
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since travel is in one direction only, average velocity = average speed

average speed = (total distance traveled)/(total travel time)

$|\bar{v}| = \dfrac{120 \,km + 80 \, km}{5 \,hrs} = 40 \, km/hr$
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May 11th, 2019, 08:02 PM   #3
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Quote:
Originally Posted by skeeter View Post
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.
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May 11th, 2019, 08:28 PM   #4
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Originally Posted by Elize View Post
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.
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Last edited by skipjack; May 11th, 2019 at 11:02 PM.
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