HELP: MATLAB program that computes the time t

Im trying to write a matlab program that computes the the time t required to reach a specfic height h. For a given value of v. The inputs should be h,v, and g. h= 100 meters, v= 50m/s and g= 9.81m/s^2

original function

h=v*t-1/2*g*t^2

this is what i have

function t = time(v,h,g)
h=(v*t-(1/2)g*t*^2)

[John D'Errico]

Sigh. I'm sure this is like the third time I've seen this question.

Hint: What does the function roots give you? (Essentially, is that not a cubic polynomial?)

Or, could you use fzero?

[Walter Roberson]

http://www.mathworks.com/help/matlab/math/parameterizing-functions.html