The distance a body 'falls' under gravity is
x = (1/2 *  a * t^2)  +  (v0 * t ) + x0

where a is the acceleration of gravity
v0 is the initial velocity
x0 is the initial x position

t is the time the body is falling

For v0 = 0, x0 = 0, t = 2:6

(1) compute x

(2)plot x versus t

(3) how long does it take to fall from the observation deck of the
Sears Tower (aka Willis Tower) in Chicago?