Results 1 to 5 of 5

Math Help - A ball is tossed...

  1. #1
    Member
    Joined
    Oct 2009
    Posts
    92

    Question A ball is tossed...

    A ball is tossed straight up into the air from a bridge,and its height above the ground t seconds after it is thrown is

    f(t)=-16t^2 + 108t + 82 feet.

    a.How high above the ground is the bridge?

    b. Write a function A(b) that gives the average velocity of the ball from t=0 to t=b seconds.Use the function to calculate the average velocity of the ball the first two seconds it is in the air.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,234
    Thanks
    27
    Quote Originally Posted by mathcalculushelp View Post
    A ball is tossed straight up into the air from a bridge,and its height above the ground t seconds after it is thrown is

    f(t)=-16t^2 + 108t + 82 feet.

    a.How high above the ground is the bridge?
    Find f(0)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    May 2009
    Posts
    211
    for b)

    A(b) = (f(0) - f(b)) / (0 - b)

    plug values and simplify
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Member
    Joined
    Oct 2009
    Posts
    92

    Help me find t...?

    -16t^2 + 180t + 48...??


    I am getting stuck at finding t.

    Iam not able to get the factors.If I use -b_+sq rt b^2 -4ac/2a then I get complicated ans.

    How should I find t?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    May 2009
    Posts
    211
    I think you need to find f(0) not f(t)=0

    -16(0)^2 + 180(0) + 48 = f(0) , that's how high the ball is
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 5
    Last Post: December 11th 2011, 08:37 AM
  2. linear map open iff image of unit ball contains ball around 0
    Posted in the Differential Geometry Forum
    Replies: 2
    Last Post: May 25th 2010, 01:15 AM
  3. A four-sided die is tossed twice
    Posted in the Statistics Forum
    Replies: 1
    Last Post: April 6th 2010, 02:59 AM
  4. Coin tossed over-n-over
    Posted in the Statistics Forum
    Replies: 0
    Last Post: October 22nd 2009, 10:12 PM
  5. Coin tossed
    Posted in the Statistics Forum
    Replies: 7
    Last Post: February 5th 2009, 07:39 AM

Search Tags


/mathhelpforum @mathhelpforum