goto http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=745.msg2801#msg2801

use the applet embedded or
the jar file http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=745.0;attach=372

set
u = 141 m/s
alpha = 45 degree

select from menu to visualize the quality
ux =
vx =

click play

what do you notice about the vx (instantaneous velocity in x direction ) ?












hint: vx = 100 m/s
extra fact: notice vx = 100 m/s = ux (initial velocity in x direction) because it is a motion in x direction without any acceleration ( ax )  so it is unchanged :)