[Potironette]

Objects being not perfectly rigid means the infinite speed of sound?
Is it something to do with how impulse requires time and if something's perfectly rigid it won't take any time?

So..impulse is force in an amount of time, so that means it takes time for momentum to be transferred and that determines if puck #1 continues in the same direction or stops.

I was pretty much guessing that an object of equal mass could bounce back because I wasn't certain what it could do '~'.
So..with lots of friction or greater mass for puck #2, then because puck #2 with friction, or puck #2 with greater mass will push puck #1 the same, puck #1 will accelerate backwards?