Results 1 to 2 of 2

Math Help - motion problem (Help)

  1. #1
    VkL
    VkL is offline
    Member
    Joined
    Oct 2008
    Posts
    96

    motion problem (Help)

    A rocket was launched upwards from the ground, and after 2 seconds, it was at a height of 96 feet.

    a.) The initial velocity of the rocket was ______
    b.) After 2 seconds the rocket was ____ (ascending / descending)
    c.) The rocket reached a maximum height of _____
    d.) The rocket landed when t =



    - I dont' know how to start this problem. They did not give enouph information it seems.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78
    Quote Originally Posted by VkL View Post
    A rocket was launched upwards from the ground, and after 2 seconds, it was at a height of 96 feet.

    a.) The initial velocity of the rocket was ______
    b.) After 2 seconds the rocket was ____ (ascending / descending)
    c.) The rocket reached a maximum height of _____
    d.) The rocket landed when t =



    - I dont' know how to start this problem. They did not give enouph information it seems.
    y(t)=\frac{1}{2}a+v_0t+y_0

    but we know (I think ) g=-32\frac{ft}{s^2} and that y_0=0

    y(t)=-16\frac{ft}{s}t^2+v_0t

    we also know that y(2)=96 so we get

    96ft=-64ft+2v_0 \iff v_0=80\frac{ft}{s}

    so know we know the equation is

    y(t)=-16t^2+80t=-16t(t-5)

    You should be able to finish from here.

    Good luck.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Motion Problem.
    Posted in the Algebra Forum
    Replies: 7
    Last Post: January 17th 2012, 01:52 AM
  2. Motion Problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: November 11th 2009, 04:41 PM
  3. motion problem
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: March 3rd 2009, 04:53 PM
  4. Replies: 1
    Last Post: February 19th 2009, 02:30 PM
  5. Motion problem
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: January 18th 2007, 10:36 PM

Search Tags


/mathhelpforum @mathhelpforum