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Homework Help: Projectiles launched from platforms of different elevation.

  1. Oct 20, 2013 #1
    1."A ball is kicked from a platform 3.2m above the ground at an angle of 20 degrees above the horizontal. If the ball lands on the ground 100m away, what is the initial velocity of the ball?" There is no air resistance acting upon the ball and we have to use constant acceleration equations.

    2. v = vo + at
    x = xo + vo t + ½ a t^2
    v^2 = vo^2 + 2a(x - xo)

    3. The farthest that Ive been able to get is that it is between 35 and 40 but that is only by guess and check which is not an acceptable method. Any input helps. Thanks!
  2. jcsd
  3. Oct 21, 2013 #2


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    Science Advisor
    Homework Helper

    Hi Vikings,

    Is it the height of the platform that is confusing you? In other words, would you be able to solve the problem if the platform were at ground height?
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