MATLAB: Index exceeds the number of array elements (1)

Question

This set of code give me the error stated in the title, how can i modify it?

disp('This program will calculate the trajectory of a ball thrown at an initial speed vo \n')

v0 = input('Please enter the initial speed');

x0 = 0;

y0 = 0;

g = 9.81;%m/s^2

T = 5 : 5 : 85;

vx = v0*cosd(T);

vy = v0*sind(T);

t=3;

y = y0 + t.*vy – (1/2*(g(t^2)));

x = x0 + t.*vx;

Answer 1

should be

g.*(t.^2)  %  not g(t.^2)