I have to write a code for the following math problem : 'Suppose a ball is thrown straight up in the air with an initial velocity of 50 feet per second and an initial height of 5 feet. How high will the ball be after 3 seconds? (NOTE: The height after t seconds is given by the expression -16t^2 + (initial velocity x t) + initial height).'

Program has one button ( compute height after 3 seconds ) and one text box.