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Homework Help: Projectile Motion cannonball

  1. Oct 1, 2014 #1
    1. The problem statement, all variables and given/known data
    A 2.5kg cannonball is fired from the top of a 75m cliff at an angle of 30 degrees above the horizontal with an initial speed of 120m/s.

    2. Relevant equations
    What is the minimum speed of the cannonball?
    When does the cannonball hit the ground?
    What is it's speed just before it hits the ground?

    3. The attempt at a solution
    I don't really have an attempt as I am not sure where to start but I would prefer guidance on how to complete the problem instead of just receiving answers.
  2. jcsd
  3. Oct 1, 2014 #2


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    What happens to the cannon ball after it is fired; that is, what forces are acting on the ball itself while it is aloft?
  4. Oct 1, 2014 #3
    just gravity
  5. Oct 1, 2014 #4


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    Good. Now write down some relevant equations under 2. And show what you have done under 3.
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