Python 2.7.6 (default, Nov 23 2017, 15:49:48) 
[GCC 4.8.4] on linux2
Type "copyright", "credits" or "license()" for more information.
>>> v0=20
>>> t=19
>>> g=9.81
>>> y=(v0*t)-(g*(t**2)/2)
>>> y
-1390.7050000000002
>>> 
