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Please. Need help with quadratic word problem

  1. Nov 11, 2009 #1
    Please. Need help with quadratic word problem!!

    PLEASE HELP WITH THIS!



    An object is launched upward at 9.8 meters per second (m/s) from a 39.2-meter tall platform.

    a)write an equation representing this path

    b) What is the height of the object after 3 seconds

    c) For what time span is the object more than 40 meters above the ground?

    d) what is the maximum height of the object

    e) how long did it take for the object to reach maximum height

    f) how long does it take for the object to hit the ground

    g) State the practical domain

    h) state the practical range
     
  2. jcsd
  3. Nov 11, 2009 #2
    Re: Please. Need help with quadratic word problem!!

    please help me with this!
     
  4. Nov 12, 2009 #3
    Re: Please. Need help with quadratic word problem!!

    to get you started...

    b) you know that the acceleration is - 9.8m/s^2 ( as its going against gravity), the initial velocity is 9.8 m/s and the time is 3s and you want out find its height. so use an equation that has all 4 of these in to calculate the height and then add the initial 39.2m height onto this answer to give you your total max hieght.
     
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