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Homework Help: Beginner Projectile Motion problem

  1. Sep 20, 2012 #1
    1. The problem statement, all variables and given/known data
    Fire a cannon ball at 30 degrees above the horizontal with an initial speed of 65 m/s from the top of a building 50 m high.

    Find the total time the cannon ball is in the air.

    What's the horizontal distance from the base of the building when the ball strikes the ground?

    2. Relevant equations

    3. The attempt at a solution
    For the time I got 7.9 s, but I don't know if that's right.
  2. jcsd
  3. Sep 20, 2012 #2


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    Homework Helper
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    How did you arrive at that result?
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