Results 1 to 3 of 3

Math Help - Falling Object in Straight Line

  1. #1
    Member
    Joined
    Jul 2009
    Posts
    132

    Falling Object in Straight Line

    An object falling in a vertical line passes a window 3 m high in 1/6 seconds. Find the distance above the top of the window from which the object let fall.

    No idea about this question at all.

    I did
    a=9.8
    thus v^2 = 19.8x
    at v=18 (at end of window)
    x=16.5
    thus origin above window = 13.5

    However answer is 15.06
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Like a stone-audioslave ADARSH's Avatar
    Joined
    Aug 2008
    From
    India
    Posts
    726
    Thanks
    2
    Lets take velocity of object at the window's starting level as "v"

    time taken by object to cross the window= 1/6 second

    So using Second equation of motion

    v*(1/6) + (9.8*(1/6)^2)/2 = 3

    This gives v

    Now Let us take the distance of origin to window = h

    Initial velocity is 0

    Velocity after traveling h distance is given by

    Using Third equation of motion


    v^2 -0^2 = 2*9.8*h

    Thus you get h after putting v
    Last edited by ADARSH; April 27th 2010 at 12:49 AM. Reason: ..
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Jan 2010
    Posts
    43


    Here's a great lecture that will explain how to do any problem of this type with no fuss, just a bit of calculus
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Falling Object
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: November 11th 2008, 08:57 PM
  2. Falling object
    Posted in the Math Topics Forum
    Replies: 6
    Last Post: July 12th 2007, 11:52 AM
  3. Falling object
    Posted in the Calculus Forum
    Replies: 4
    Last Post: July 2nd 2007, 12:27 PM
  4. Falling object
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: June 6th 2007, 04:12 PM
  5. Object traveling straight line...
    Posted in the Calculus Forum
    Replies: 2
    Last Post: October 3rd 2006, 07:12 PM

Search Tags


/mathhelpforum @mathhelpforum