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Homework Help: Projectile Motion difficulty

  1. Oct 1, 2007 #1
    1. The problem statement, all variables and given/known data

    How far will a stone travel over level ground if it is thrown upward at an angle of 35 degrees with respect to the horizontal and with a speed of 20 m/s?

    What is the maximum range that can be achieved if a stone is thrown with an initial speed of 24 m/s?

    3. The attempt at a solution

    I've worked out both questions using the formula:

    R = (Vo^2*sin(2 theta)) / g

    For the first question I calculated a distance of 38.35m, and for the second (using the angle 45°) 58.77m. However, both of the answers have been marked incorrect. I've tried different sig figs etc. Am I doing something wrong? Is there any other way to solve these two problems? Thank you in advance for any help!

  2. jcsd
  3. Oct 1, 2007 #2


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    Science Advisor
    Homework Helper

    Not sure where you got that formula but, 38.35 and 58.77 is correct assuming they mean the stone is thrown with that speed along that angle.
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