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defmodule Drop do
  def fall_velocity(:earth, distance) when distance >= 0 do
    :math.sqrt(2 * 9.8 * distance)
  end
  def fall_velocity(:moon, distance) when distance >= 0 do
    :math.sqrt(2 * 1.6 * distance)
  end
  def fall_velocity(:mars, distance) when distance >= 0 do
    :math.sqrt(2 * 3.71 * distance)
  end
end