if you need help-file for [pong], try this code :
#N canvas 432 371 493 449 12; #X obj 78 238 pong 0 0 0 0; #X obj 78 108 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1 ; #X obj 293 292 vsl 15 128 0 127 0 0 empty empty empty 0 -8 0 8 -262144 -1 -1 8875 1; #X obj 99 132 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X obj 39 300 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1 -1; #X floatatom 181 97 5 0 0 0 - - -; #X floatatom 181 121 5 0 0 0 - - -; #X floatatom 181 146 5 0 0 0 - - -; #X obj 113 57 loadbang; #X msg 124 82 100; #X msg 125 118 1; #X floatatom 236 185 5 0 0 0 - - -; #X floatatom 236 210 5 0 0 0 - - -; #X text 228 94 initial height; #X text 230 120 initial velocity; #X text 230 146 damping (1 = none); #X floatatom 138 287 5 0 0 0 - - -; #X obj 108 322 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1; #X msg 28 148 reset; #X text 61 298 bouce; #X text 130 320 above hand height; #X text 193 285 velocity; #X text 289 185 hand force (1 = none); #X text 291 211 hand height; #X text 37 26 pong :: a bouncing ball model; #X connect 0 0 4 0; #X connect 0 1 17 0; #X connect 0 2 16 0; #X connect 0 3 2 0; #X connect 1 0 0 0; #X connect 3 0 0 0; #X connect 5 0 0 1; #X connect 6 0 0 2; #X connect 7 0 0 3; #X connect 8 0 9 0; #X connect 8 0 10 0; #X connect 9 0 5 0; #X connect 9 0 12 0; #X connect 10 0 7 0; #X connect 10 0 11 0; #X connect 11 0 0 4; #X connect 12 0 0 5; #X connect 18 0 0 0;