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Homework Help: Object Thrown Vertically Upward

  1. Feb 6, 2012 #1
    1. The problem statement, all variables and given/known data:

    A ball is thrown vertically upward with a speed of 20.0m/s.

    i) How fast is it moving when it reaches 16m
    ii) How long is required to reach this height?
    iii) Explain why there are two answers.

    2. The attempt at a solution
    I assume there are two vectors. The force of the ball going upwards and the force of gravity pulling the ball downwards.

    Thanks in advance for helping.
  2. jcsd
  3. Feb 6, 2012 #2
    There is no force upwards because the ball is in free flight. Therefore the only force is due to gravity.

    Using a=g you can derive all the formula you need by integrating wrt time:

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