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