function in Haskell that can solve an equation -

function in Haskell that can solve an equation -

i need write function in haskell can solve next problem(physic_problem): height (in whole number of meters) of shortest building drop ball such take @ to the lowest degree 5 seconds nail ground? equation can found here http://en.wikipedia.org/wiki/equations_for_a_falling_body

i tried hard on , need help!

thank much!

consider instance this,

g :: double g = 9.81 dist :: double -> double dist t = g * t^2 / 2

then,

> dist 5 122.625

additionally may want create module out of equations in wiki.

update

for delivering integral value consider example

dist' :: (integral a) => double -> dist' t = ceiling $ g * t^2 / 2

here utilize ceiling (upper bound), yet note converting integral other rounding functions. hence,

> dist' 5 123

function haskell