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How do you convert m/s^2 to km/h?

  1. Sep 22, 2004 #1
    How do you convert m/s^2 to km/h?
     
  2. jcsd
  3. Sep 22, 2004 #2

    plover

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    At least in the form you asked the question, you can't. m/s2 is a unit for acceleration while km/h is a unit for speed.
     
  4. Sep 22, 2004 #3
    well you can if you have the delat t of a
     
  5. Sep 22, 2004 #4
    But if you are trying to convert ms^-1 than its rather easy, theres a couple ways of doing it.
    I do it like such
    ((36km/60)/60)*1000
    which is equal to 10ms^-1

    Theres some really easy way to do it, but this one never fails and it doesnt take that much longer so i just use this one.
     
  6. Sep 22, 2004 #5
    Oh, that would make sence wouldnt it, lol. Im trying to figure out this problem.
    A bus traveling at +29 km/h accelerates at a constant +3.7 m/s2 for 6.3 s. What is its final velocity in km/h?
    This is my work so far, what am I doing wrong.
    Vi = 29Km/h
    a = 3.7m/s^2
    t = 6.3s
    Vf = ?

    Vf = Vi + at
    Vf = 29 + 3.7 * 6.3
    Vf = 52 - With right sig figs
     
  7. Sep 22, 2004 #6

    plover

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    Looks good to me.
     
  8. Sep 22, 2004 #7
    Thats what I thought but the damn webassign keeps marking it wrong.
     
  9. Sep 22, 2004 #8
    I can see why from here,
    Vf = Vi +at
    SI UNITS!
    Velocity SI unit is ms^-1
    Therefore 29kmh^-1
    Needs to be converted to ms^-1
     
  10. Sep 22, 2004 #9
    What is its final velocity in km/h?
    And then convert it back
     
  11. Sep 22, 2004 #10
    You have to remember to convert stuff, i will never forget, i lost 15 marks out of 50 on my last exam from not converting to the SI units
     
  12. Sep 22, 2004 #11
    I converted 29km/h to 8.0556m/s the multiplied 8.0556 + 3.7 * 6.3 = 30.6256
    then converted that to 110. That obviously isnt right, what am I doing wrong.
     
  13. Sep 22, 2004 #12

    plover

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    Bleah. Of course. I wasn't looking at the units.
     
  14. Sep 22, 2004 #13
    Seems right to me... Remember, think of how long 6.3 seconds is when your accelerating in a car. Like when you go onto a freeway, you would really only accelerate for about 3 seconds to get to 100km, from about 50..., so 6 seconds is actually a long time to accelerate for
     
  15. Sep 23, 2004 #14

    Try evaluating this again I don't seem to get the same answer for 8.05556+(3.7*6.3) as you do.

    (and hence the converted figure is different as well)
     
  16. Sep 23, 2004 #15
    This really depends on how hard you put your foot on the accelerator (or how good your car is!)
     
  17. Sep 23, 2004 #16
    Yes, but you know what i mean, 6.3 seconds is a long time to accelerate, although the sound of it isnt very much, its a pain in the A$$ if you look at your watch and wait for 6 or 7 seconds to pass...
     
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