00:01
This is the basic momentum equation, right? okay, and we know that this second one is at west.
00:20
But also we have a shortcut for head -on elastic collisions.
00:41
Okay? and that shortcut is that b1i plus b1f is equal to b2f.
00:53
Okay? so then you can use this, put this back into that equation over there.
00:58
And then we end up with m1b1i equals m1b1f plus m2 times b1i plus b1f.
01:15
Okay? and then you can just rewrite all of this to be easier to deal with and conceptualize.
01:32
Okay? and then you can put all the 1i's on one side of the equation and all the 1f's on one side of the equation.
01:43
Alright? okay? so then that is m1 minus m2 b1, sorry, b1i equals m1 plus m2 b1f.
02:15
Okay? so then that means b1f is equal to b1i m1 minus m2 over m1 plus m2...