Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Help on velocity and displacement

  1. Aug 21, 2005 #1

    QT

    User Avatar

    Question:
    Simpson drives his car with an average velocity of 48.0 km/h to the east, How long will it take him to drive 144 km on a straight highway?


    now i know you start out with the given which is :
    Vavg= 48.0 km/h east
    delta x= 144km
    delta t= ?
    so you have to find the delta t but i dont know how
     
  2. jcsd
  3. Aug 21, 2005 #2
    Umm. Isn't this just a case of [tex] Speed = \frac {Distance} {time} [/tex]
    :bugeye:

    ie... re-arranging this equation.
     
    Last edited: Aug 21, 2005
  4. Aug 21, 2005 #3
    But make sure to include direction, as velocity and displacement are vectors.

    [tex]\vec{v}=\frac{{\triangle}\vec{d}}{\triangle{t}}[/tex]
     
    Last edited: Aug 21, 2005
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook