u really want a input field for v1 n v2?
that would mean a lot of possibilities,
e >1 super elastic
e=1 ok
0>e>1 ok
e =0 ok
e<0  impossible to happen

what computer responses are required for e>1 and e<0 ?
a text message? "super elastic" or "impossible!,
re key v1 n v2"

any thoughts?

i would not be able to add on to the same simulation, i will have to release another version cos the codes need to be reprogrammed with v1 n v2 as inputs

Hi prof hwang!
i am at Radisson Hotel Ontario Airport
2200 East Holt Boulevard
Ontario, California 91761
United States

but notice the forum still capture as 04:26:31 pm posted from:SINGAPORE,SINGAPORE,SINGAPORE
for your info :)