Results 1 to 6 of 6

Math Help - Help with Transposition

  1. #1
    Newbie
    Joined
    Dec 2009
    Posts
    3

    Help with Transposition

    Hello, I have joined this forum in hopes of finding the answers to my question, is their anybody who can spare the time to give me a quick run through this question?

    V^2 = U^2 + 2as


    Thanks, in advance.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,403
    Thanks
    1486
    Awards
    1
    Quote Originally Posted by DJSmith3000 View Post
    Hello, I have joined this forum in hopes of finding the answers to my question, is their anybody who can spare the time to give me a quick run through this question?
    V^2 = U^2 + 2as
    What is the question?
    I see an equation. But no question..
    Tell what you have been asked to do to or with that equation.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Grandad's Avatar
    Joined
    Dec 2008
    From
    South Coast of England
    Posts
    2,570
    Hello DJSmith3000

    Welcome to Math Help Forum!
    Quote Originally Posted by DJSmith3000 View Post
    Hello, I have joined this forum in hopes of finding the answers to my question, is their anybody who can spare the time to give me a quick run through this question?

    V^2 = U^2 + 2as


    Thanks, in advance.
    I'm not sure that this really is a question. The equation
    v^2=u^2+2as
    gives the relationship between the initial ( u) and final ( v) velocities, when a body moving with a constant acceleration ( a) moves through a certain distance ( s).

    The easiest way to derive it is to use the Work-Energy Principle, which states that the work done on a body is equal to the increase in its Kinetic Energy. Thus, if a constant force F acts on a body of mass m, giving it a (constant) acceleration a, we have:
    F = ma
    and so if the body now moves through a distance s in the direction of the force, the work done on the body is:
    Fs = mas
    This increases the body's KE from \tfrac12mu^2 to \tfrac12mv^2, where u and v are the initial and final velocities. So, using the Work-Energy Principle, we have:
    mas = \tfrac12mv^2 - \tfrac12mu^2

    \Rightarrow v^2=u^2+2as
    Grandad
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Dec 2009
    Posts
    3
    im sorry, i forgot to put that part...
    i have to make U then S the subject
    thanks for replying
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor
    Grandad's Avatar
    Joined
    Dec 2008
    From
    South Coast of England
    Posts
    2,570
    Hello DJSmith3000
    Quote Originally Posted by DJSmith3000 View Post
    im sorry, i forgot to put that part...
    i have to make U then S the subject
    thanks for replying
    v^2=u^2+2as

    \Rightarrow v^2-2as=u^2

    \Rightarrow u = \sqrt{v^2-2as}

    And v^2=u^2+2as

    \Rightarrow v^2-u^2=2as

    \Rightarrow s = \frac{v^2-u^2}{2a}

    Grandad
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Dec 2009
    Posts
    3
    Thank you so much =]
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Transposition....
    Posted in the Algebra Forum
    Replies: 6
    Last Post: March 7th 2012, 07:47 AM
  2. Transposition Help
    Posted in the Algebra Forum
    Replies: 4
    Last Post: January 2nd 2010, 10:34 AM
  3. Transposition
    Posted in the Algebra Forum
    Replies: 5
    Last Post: June 22nd 2009, 11:46 PM
  4. Help with transposition
    Posted in the Algebra Forum
    Replies: 2
    Last Post: May 14th 2009, 12:30 AM
  5. Transposition - HELP!!
    Posted in the Algebra Forum
    Replies: 2
    Last Post: May 7th 2009, 11:03 AM

Search Tags


/mathhelpforum @mathhelpforum