@Hamed said in Impulse output:
NaN means not a number like @Aidan-Oxley says.
I've built a newtons cradle, just make sure to set no air resistance so there is no energy lost and set bounciness to a number on each ball.
I believe the units of measurement is Newton seconds.
If you set air resistance to 0, that will make the Newton's cradle a perpetual motion machine, right @Hamed?