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Homework Help: Converting mph

  1. Sep 2, 2006 #1
    i need some help on a problem... does anyone know how to convert 65mph into ft/s and km/h? i would appreciate it THANKS! =)
     
  2. jcsd
  3. Sep 2, 2006 #2
  4. Sep 2, 2006 #3

    Meir Achuz

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    I find it convenient to know that 60 mph=88 f/s,
    and 50 mph=80 km/h.
     
  5. Sep 2, 2006 #4

    Galileo

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    First you need to know how many feet are in a mile.
    I looked up that a foot is 1/3 of a yard and a mile is 1760 yards, so there are 3*1760=5280 feet in a mile (God, I hate these units)

    Then you can just write:
    1 [mile/hour] = 1 [5280 ft/3600 seconds]=5280/3600 ft/s=22/15 ft/s.

    EDIT: There are 3600s in an hour. duh.
     
    Last edited: Sep 2, 2006
  6. Sep 2, 2006 #5
    when i convert 65 mph into ft/s is it 95.33 ft/s and and when converting 65mph into km/h is it 104.60736 km/h?
     
  7. Sep 2, 2006 #6
    is this correct?
     
  8. Sep 3, 2006 #7

    Meir Achuz

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    You should learn about significant figures.
     
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