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!

Homework Help: Size and direction of the change in velocity

  1. Sep 20, 2007 #1
    1. The problem statement, all variables and given/known data
    Find Size and direction of the change in velocity:

    a)5m/s west to 10 m/s west

    b)10m/s west to 5m/s west

    c)5m/s west to 10m/s east

    2. Relevant equations

    3. The attempt at a solution

    a)10-5= 5 west

    b)5-10=-5 because there isn't size wihe negitve the answer will be 5 to oppicite direction (east)

    C) My problem here the book says the answer will be 15 m/s east but I don't how it come up with it ?

    can you explain it for me ?
  2. jcsd
  3. Sep 20, 2007 #2
    5m/s west is equal to -5m/s east.
  4. Sep 21, 2007 #3
    Think you FedEx
    5m/s west to 10m/s east = 15 m/s east here my problem
    From where I can get 15? why does the book add them?even I know that if I want to know finall velocity v2-v1 but here v2+v1 why ????????
  5. Sep 21, 2007 #4
    (10m/s east) - (5 m/s west) = (10 m/s east) - (- 5m/s east) = 15 m/s east
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook