Results 1 to 3 of 3

Math Help - Math in the real world

  1. #1
    Member
    Joined
    Nov 2008
    Posts
    87

    Math in the real world

    We throw a rock into the air with initial velocity of 96 ft/sec, and initial position of 5 ft. Find how high the rock goes before coming back down. To answer this question, fill in the blanks in the following sentence, where the first blank gives this height, and the second blank gives how many seconds into the flight of the rock it reaches this maximum height.
    The rock reaches its highest position of _______ feet above the ground after _______ seconds of flight

    How can solve this problem?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member vincisonfire's Avatar
    Joined
    Oct 2008
    From
    Sainte-Flavie
    Posts
    469
    Thanks
    2
    Awards
    1
    You can use the formula  v_f^2=v_i^2 + 2 a \Delta s
    You know what you final velocity is (at the top), the initial velocity as well and a is the gravitational acceleration. Solve for \Delta s to find the displacement and don't forget to add the initial height.
    Then you can use \Delta s = v_i \Delta t+ \frac{a \Delta t^2}{2} and solve for t to find how long it took.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jan 2009
    Posts
    4
    i would also draw your self a diagram so that you can see yourself what is really happening. the maths in questions like this is usally easy but the prob is to find out what way to do it. after that you just fill into you formula.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] real world example
    Posted in the Calculus Forum
    Replies: 2
    Last Post: January 9th 2012, 01:06 PM
  2. Real World Algebra Problem!
    Posted in the Business Math Forum
    Replies: 2
    Last Post: December 17th 2011, 08:46 PM
  3. real world problem with 'average'
    Posted in the Statistics Forum
    Replies: 3
    Last Post: December 3rd 2009, 06:50 AM
  4. Real World Problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: September 15th 2009, 11:50 AM
  5. Integration in the real world
    Posted in the Calculus Forum
    Replies: 2
    Last Post: December 2nd 2006, 08:06 AM

Search Tags


/mathhelpforum @mathhelpforum