Psuedo-Code

DISPLAY "What is the width of the kite in centimeters:";
READ width
WHILE width is not between 1 and 400, loop
ELSE, RUN

DISPLAY "What is the length of the kite in centimeters:";
READ length;
WHILE length is not between 1 and 400, loop
ELSE, RUN

DISPLAY "The width is " width " centimeters and the length is " length " centimeters.";

area = (length * width) / 2;

DISPLAY "The area of the kite is " area / 10000 " square meters.";

aspect_ratio = width/length;

IF aspect_ratio >= 1, DISPLAY "WARNING! Aspect ratio >= 1. Unstable.";
ELSE, DISPLAY "Aspect ratio < 1. Good aspect ratio.";

mass = 135 * (area/10000);
DISPLAY "The mass of your kite is " mass " grams.";

gravitational_pull = mass * 9.81;
DISPLAY "The gravitational pull of your kite is " gravitational_pull " grams * m/s^2";

RETURN