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Homework Help: Velocity/displacement/time problem

  1. Feb 19, 2013 #1
    1. The problem statement, all variables and given/known data

    A person on an apartment balcony holds a ball over the balcony and throws it directly upwards with an initial velocity of 30 m/s [up]. The ball was thrown from 15 m above the ground. How long will it take for the ball to hit the ground?

    2. Relevant equations

    3. The attempt at a solution

    The givens I have here so far I think is:
    V1 = 30 m/s [up]
    V2 = 0 m/s
    ∇d = 15 m
  2. jcsd
  3. Feb 20, 2013 #2
    Why do you think v2=0?
    You don't need this anyway.

    Draw your y-axis and choose a location for the origin, and then write down the information you are given taking care with the signs.

    Then you can just choose the most appropriate suvat equation.
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