Results 1 to 4 of 4

Math Help - Physics question I need some help with...

  1. #1
    M23
    M23 is offline
    Newbie
    Joined
    Jun 2009
    Posts
    19

    Physics question I need some help with...

    A water balloon is dropped on some unsuspecting sunbathers from a stationary hot air balloon. The water balloon is 353 m above the beach. If the water balloon accelerates downwards at 9.81 m/sē, how long will it take to hit the beach?


    Any help would be much appreciated.
    Last edited by M23; October 12th 2009 at 09:10 PM. Reason: I wasn't polite at all =\
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Jan 2008
    Posts
    588
    Thanks
    87
    Use the formula
     s = \frac{1}{2}at^2

    Where s is displacement (height)
    a is acceleration
    t is time
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member
    Joined
    Feb 2008
    Posts
    383
    Quote Originally Posted by M23 View Post
    A water balloon is dropped on some unsuspecting sunbathers from a stationary hot air balloon. The water balloon is 353 m above the beach. If the water balloon accelerates downwards at 9.81 m/sē, how long will it take to hit the beach?


    Any help would be much appreciated.
    Here is an example:

    A ball is thrown vertically upwards with speed 20m/s from the top of a tower of height 25m. Find the time until the ball hits the ground

    so:
    a=-9.8
    u=20
    t?
    v=X
    x or s = -25

    s=ut+0.5at^2

    -25=20t+1/2*(-9.8)*t^2
    -25=20t-4.9t^2
    4.9t^2-20t-25=0
    t=5.08498

    The ball hits the ground after 5.08s (3s.f.)

    Use this principle, to work out your question!

    The answer should work out to be 8.48s (3s.f.) if I've done it correctly.

    Please anyone else correct me if im wrong!
    Follow Math Help Forum on Facebook and Google+

  4. #4
    M23
    M23 is offline
    Newbie
    Joined
    Jun 2009
    Posts
    19
    Thanks a lot!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Got a physics question or interested in physics?
    Posted in the Math Topics Forum
    Replies: 16
    Last Post: February 3rd 2014, 02:56 AM
  2. Question regarding physics?
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: September 19th 2010, 01:38 PM
  3. Physics Question
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: October 17th 2009, 11:36 PM
  4. Physics question
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: April 29th 2008, 05:28 AM
  5. Another physics-like question...
    Posted in the Advanced Applied Math Forum
    Replies: 5
    Last Post: October 29th 2006, 07:09 AM

Search Tags


/mathhelpforum @mathhelpforum