lgbasallote
A person walks first at constant speed of 5.00 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 3.00 m/s. What is her average speed over the entire trip?
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lgbasallote
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15 meters?
lgbasallote
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why not just 1? i mean it's simpler isnt it?
shubhamsrg
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total dist = 2d
total time = d/5 + d/3 = 8d/15
so avg speed = 2d/(8d/15)
so @A.Avinash_Goutham was right!! yet again! :D
Nick_Black
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4m/s
lgbasallote
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so it will be 30/8 seconds?
FoolForMath
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When the distance is fixed, just find the harmonic mean.
lgbasallote
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i mean m/s
lgbasallote
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what does harmonic mean mean again?
FoolForMath
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For two number a and b the harmonic mean is given by 2ab/(a+b)
kropot72
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Speed = (distance traveled)/(time taken)
Total distance traveled = 0
Speed = 0 m/s
lgbasallote
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where a and b are...?
lgbasallote
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the given values?
cwrw238
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speed = distance / time
if distance = 1
5 = 1 / 0.2
also
3 = 1 / 0.3333
average speed = 2 / 0.53333
FoolForMath
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a=5 and b =3 or vice-versa
Nick_Black
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its 3.75 m/s 4 is wrong
A.Avinash_Goutham
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if it's equal " time " u shud use........arithmetic nd equal dist u shud use..........harmonic
lgbasallote
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this is effective everytime d is equal?
Nick_Black
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total distance /total time travelled
FoolForMath
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Yes lgba and when time is equal find the arithmetic mean.
lgbasallote
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arithmetic mean is..?
Nick_Black
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2d
-----------
d +d
-- ----
5 3
2d
---------
8d
------
15
2
----
8
------
15
Nick_Black
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2
----
8
---
15
15
----
4
lgbasallote
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lol yeah i got that part =)) btw...a follow-up question is what is the average velocity...the book says zero...is it because displacement is 0?
A.Avinash_Goutham
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yeah it is zero
shubhamsrg
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yes,,because disp is 0..
Nick_Black
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but its speed written in the question???
lgbasallote
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the first question was average speed
Nick_Black
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yeah but there is a difference displacement can come to zero bot distance cannot u should mention adds up whether how many time come and go from same point asdisplacement get zero
Nick_Black
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distance adds up*
javawarrior
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lol really? at 5m/s ?
lgbasallote
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what? o.O
javawarrior
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A person walks first at constant speed of 5.00 m/s <== that guy must be one heck of a power walker haha