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Minimum initial velocity of the projectile launched at what angle

  1. Sep 11, 2012 #1
    1. The problem statement, all variables and given/known data
    Assume there is a wall located 100m downrange (x=100) from the projectile launching position (x=0) that is 55m (y=55) high. What is the minimum initial velocity of the projectile launched at what angle necessary to clear the wall?


    2. Relevant equations
    h=(v^2sin^2α)/2g


    3. The attempt at a solution
    I can find the displacement but I'm confused as to how I am supposed to find both velocity and the projectile angle from this information.
     
  2. jcsd
  3. Sep 11, 2012 #2
    2 unknowns, angle and velocity.
    Then you have find 2 equations to solve the problem.
     
  4. Sep 11, 2012 #3

    CAF123

    User Avatar
    Gold Member

    Do exactly what azizlwl said. You have two unknowns, so you need two equations to get a solution. You could find one of those equations by considering energy and the other by using projectile kinematics.
     
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