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To solve you use y=VoT+aT2. You know that initial velocity is 0 so the fist term can be canceled and y=70. Than you just solve for T and divide 0.25 by T. a is acceration of gravity, 32.2 ft/(s^2) or (9.8 meters/second-squared). T = ?(2y/a) The T will be in seconds. Velocity = 0.25/T The velocity will be meters per seconds

  • what are you trying to do? -

    I do not have a clue what the question is but see an error in the first step
    y = Vo t + (1/2) a t^2
    you forgot the 1/2

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