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  • Oct 24, 2009, 11:13 AM
    caseyjoe
    Free-Fall Kinematics
    I'm struggling. A ball is thrown downward with an initial speed of 20 m/s. I need to calculate the time required to reach a speed of 50 m/s. Can you help?
  • Oct 24, 2009, 11:24 AM
    Unknown008

    Yup, you need to know your kinematics formulae well and that would be a piece of cake :)

    Use

    V being the final velocity, u the initial velocity, a the acceleration due to gravity and t the time elapsed between the final and initial speed. Give it a try, and post the answer :)
  • Oct 24, 2009, 11:29 AM
    caseyjoe
    -50 m/s = -20m/s + (-9.8m/s/s x t)
    t = 3.06s
  • Oct 24, 2009, 11:32 AM
    Unknown008

    Well done! :)

    You see, it's easy!

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