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Homework questions, help or hints much appreciated =D

  1. Feb 8, 2007 #1
    1. A ball is thrown upward. Its initial vertical speed is 10.4 m/s, acceleration of gravity is 9.8 m/s^2, and maximum height hmax are shown in the figure below. What is its height, hmax? Answer in units of m. Neglect: air resistance

    For this one I used 3 different formulas in different ways and each answer I got was wrong when I checked it. I divided 10.4 and 9.8 and got .9423076923 for time. Then I plugged that into a distance formula of d=ViT+1/2aT^2 and got 16.55510205 which was wrong.

    2.A ball is thrown upward. Its initial vertical speed is v0, acceleration of gravity is 9.8 m/s^2, and maximum height is 5.5 m, as shown in the figure below. What is its initial vertical speed, v0? Answer in units of m/s. Neglect: Air resistance

    So since the initial vertical speed is v0 wouldnt the initial velocity just be 0?? And so the answer is 0??
     
  2. jcsd
  3. Feb 8, 2007 #2

    radou

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    Homework Helper

    Did you plug in the negative sign for gravitational acceleration?

    What does the velocity of the ball equal at the point of the maximum height?
     
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