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how do you calculate if a block of wood dropped form a tall building has attained a velocity of of 78.4 m/s, how long has it been falling?

  • Science -

    I don't understand the question.

  • Science -

    if gravity is rounded to 10 and 78.4 is rounded to 78:

    -then, time= velocity/gravity

    time=78/10
    time=7.8

    or...
    time=78.4/9.8
    time= 8

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