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Homework Help: Height, Velocity, Angle, Gravity = Range

  1. Jan 5, 2009 #1
    1. The problem statement, all variables and given/known data
    Im working on a project for school. We're suppost to learn something and teach it to the class, and im having a hard time with this one. What im looking for is an equation. I just don't know how to work height into what I have figured out so far. It is projection based.

    Looking for range.
    V(in)= 80 m/s
    Angle= 45
    Starting height Height= 7.5 ft

    2. Relevant equations
    No air resitence
    Gravity is in effect

    3. The attempt at a solution
    If I was from the ground the equation would look like this

    R = 24 m/s^2 sin 2 45* giving me 58.716 meters
    ----- 9.81 m/s^2
  2. jcsd
  3. Jan 5, 2009 #2


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    Gold Member

    Try the equation d_f = (at^2)/2 + v_i(t) + d_i. Find the time first and then calculate the range.
  4. Jan 5, 2009 #3
    Im so dence... I have it figurd out now lol. Thanks anyway! My final velocity is the same, just moving downward. I have acceleration, and distance. Thanks!
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