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Projectile Motion Help

  1. Oct 15, 2012 #1
    I am really stuck on these two hw problems.

    1. Basically, there is a cannon which will launch a ball at 60 degrees respect to the x axis. There is also a helicopter 90 feet away from the cannon and 70 feet up. What intial velocity will the cannon ball need to be launched with in order to hit the helicopter.

    For this one I got vi = 43 m/s and t = 3.8 s but the x and y components dont add up

    2. Find the two angles that will ensure that a cannon ball traveling at 35 m/s will land 29 meters away.

    Dont know where to start on this.
     
  2. jcsd
  3. Oct 15, 2012 #2
    Why don't you show us your work so we know what you did.
     
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