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Homework Help: Projectile from a moving vehicle

  1. Oct 18, 2010 #1
    1. The problem statement, all variables and given/known data

    Joe is in a car travelling 90km/h, following Mark in a car 20m ahead travelling 110km/h. Joe then decides to throw a water balloon at Mark at an angle of 45 degrees in order to hit Mark. What speed should the water balloon be launched?

    Vi = 14m/s
    Vf = -14m/s
    a = -9.8m/s^2
    t =
    d = 20m

    V = 14m/s
    t =
    d = 20m

    I used the equation d(horizontal) = v^2/g x Sin2(theta) in order to find the horizontal vector component of 14m/s which is equal to the vertical vector component, as the degree is 45. This would mean the hypotenuse is 19.8 m/s, which would be the launching speed, but how would the velocity of the two cars affect it? As well as the further ahead car going a faster speed.
  2. jcsd
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