changes made:

1 added help text in the codes
2 re do all objects in new Ejs 4.2.7 for future deployment
3 added text new objects to be ARIAL 30 and pixel size true for subscript to appear
4 studied the original codes from FKH
5 added style 1 the original representation of vi + delta v = vf
6 going to customize to style 2 of vf - vi = delta v , which is the sg syllabus
7 made the representation of the vector diagram draggable away from the centre fo the circle motion
8 added r from R
9 added rs
10 trace follow xs and ys
11 added clockwise and anticlockwise icon from wikipedia
12 added more display slider of the values of the simulation for sense making
13 added angle d theta