How do I write an m-file that prompts a single three-valued vector?

The general equation for the distance that a freely falling body has traveled (neglecting air friction) is d=1/2gt^2. Assume that the acceleration due to gravity g = 9.8m/s2. Write an m-file script that prompts the user a single three-valued vector containing the start time, increment and end time in seconds. Your script should calculate and display a table of time and distance traveled in meters for time values from start time to end time by the increment.

[Star Strider]

See the documentation for the inputdlg (link) function.