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Kinematics with multiple objects

  1. Oct 15, 2011 #1
    1. The problem statement, all variables and given/known data
    Mike is standing below a tower. His friend on top of the tower which is 580 m drops a ballon at him. At the instant mike fires a potato from a cannon moving at an initial velocity of 95 m/s. How long does it take for the ballon and potato to collide?


    2. Relevant equations
    vf=vi+at
    vf^2=vi^2+2ax
    x=vi*t+0.5at^2
    x=0.5(vi+vf)t


    3. The attempt at a solution
    What i did is split it into 2 parts one for the ballon and potato. The potato equation was
    x=95t+0.5(-9.81)t^2
    And the ballon equation as
    x=0.5(9.81)t^2
    and then i set them equal to each other and solved.
    I got t=9.684 s
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 16, 2011 #2
    At t = 0 both the potato and balloon are at x = 0 do they both start at the same point? I think you want to measure distances from some common point, either at the bottom of the tower or at the top?
     
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