lgbasallote
  • 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?
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
:/
anonymous
  • anonymous
30/8
lgbasallote
  • lgbasallote
15 meters?

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More answers

lgbasallote
  • lgbasallote
why not just 1? i mean it's simpler isnt it?
shubhamsrg
  • shubhamsrg
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
anonymous
  • anonymous
4m/s
lgbasallote
  • lgbasallote
so it will be 30/8 seconds?
anonymous
  • anonymous
When the distance is fixed, just find the harmonic mean.
lgbasallote
  • lgbasallote
i mean m/s
lgbasallote
  • lgbasallote
what does harmonic mean mean again?
anonymous
  • anonymous
For two number a and b the harmonic mean is given by 2ab/(a+b)
kropot72
  • kropot72
Speed = (distance traveled)/(time taken) Total distance traveled = 0 Speed = 0 m/s
lgbasallote
  • lgbasallote
where a and b are...?
lgbasallote
  • lgbasallote
the given values?
cwrw238
  • cwrw238
speed = distance / time if distance = 1 5 = 1 / 0.2 also 3 = 1 / 0.3333 average speed = 2 / 0.53333
anonymous
  • anonymous
a=5 and b =3 or vice-versa
anonymous
  • anonymous
its 3.75 m/s 4 is wrong
anonymous
  • anonymous
if it's equal " time " u shud use........arithmetic nd equal dist u shud use..........harmonic
lgbasallote
  • lgbasallote
this is effective everytime d is equal?
anonymous
  • anonymous
total distance /total time travelled
anonymous
  • anonymous
Yes lgba and when time is equal find the arithmetic mean.
lgbasallote
  • lgbasallote
arithmetic mean is..?
anonymous
  • anonymous
2d ----------- d +d -- ---- 5 3 2d --------- 8d ------ 15 2 ---- 8 ------ 15
anonymous
  • anonymous
2 ---- 8 --- 15 15 ---- 4
lgbasallote
  • lgbasallote
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?
anonymous
  • anonymous
yeah it is zero
shubhamsrg
  • shubhamsrg
yes,,because disp is 0..
anonymous
  • anonymous
but its speed written in the question???
lgbasallote
  • lgbasallote
the first question was average speed
anonymous
  • anonymous
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
anonymous
  • anonymous
distance adds up*
anonymous
  • anonymous
lol really? at 5m/s ?
lgbasallote
  • lgbasallote
what? o.O
anonymous
  • anonymous
A person walks first at constant speed of 5.00 m/s <== that guy must be one heck of a power walker haha

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