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Jo student undertakes a unique experiment with his calculator. He goes to the school roof that is 18.0 m above the ground. He throws the poor calculator upward with a velocity of 42 m/s. Assume that the calculator goes straight up and just misses the roof on its way to the ground.

Calculate the velocity with which the calculator will hit the ground.

  • Physics -

    For an easy solution, use conservation of energy.
    Vo = 42 m/s
    Vf = final velocity
    M ='mass
    H ='rooftop height

    MgH + (M/2)Vo^2 = (M/2)Vf^2

    Cancel out the M and solve for Vf

    Vf^2 = Vo^2 + 2 g H

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