1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Average speed without time

  1. Sep 23, 2009 #1
    1. We drive a distance of 1 kilometer at 14 km/h. Then we drive an additional distance of 1 kilometer at 30 km/h. What is our average speed?



    2. average speed= total distance / total time


    3. 22mp/h
     
  2. jcsd
  3. Sep 23, 2009 #2
    If your velocity is 14km/h, then if you drove a distance of 14km it would take you 1 hour, as I'm sure you're aware. Thus if you only drove a distance of 1 km . . .

    What is the formula for velocity? Think about the dimensions (units) of velocity.
     
  4. Sep 23, 2009 #3
    the formula for velocity is

    v= distance / time


    and i think the 14 km/h is regarding the speed
     
  5. Sep 23, 2009 #4
    Yes, you're right. I tend to use velocity as synonymous with speed, which isn't correct. Often it will be negligible, though.

    Speed=Distance/Time

    Just plug and crank, now.
     
  6. Sep 23, 2009 #5
    but i dont know how to find the time
     
  7. Sep 23, 2009 #6
    Speed=Distance/Time

    If your speed is 14km/h,
    and you travel a distance of 1 km,
    then the time is ?

    I'm sorry, I'm not sure I can walk you much farther without giving you the answer, but let me know if this doesn't help and I'll think of another way. =)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook