To register at http://www.box2d.org/forum/index.php there are difficult and annoying questions. But I solved one of them which was easiest for me, so I share in case someone else will want to register there:
A ball of mass 3 kilograms begins falling with gravity of 10 meters per second squared. How many meters does it fall in 8 seconds?
use formula:
s = (t^2 *a)/ 2 - ut
s - distance
u - initial velocity
v - end velocity
t - time
so the answer is 320
I just went there and clicked on 'Register' and wow, that's nuts!! It's a great way to discourage newbies from joining the community, that's for sure. I guess it's their goal to have a little elitist group of experts.
I saw in their forum they say they want to have less spam. But yeah, this also makes have less users. Especially javascript forum is very inactive :(
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