Today in Unit 4 everything was basically the same as Unit 3, except a lot more complicated! Instead of us thinking in 1 dimension we had to think in 2 dimension. And well it blew my mind, although it was pretty easy to pick up after lunch. The calculations / equations are the same except instead of a simple
D
A
T
V
Vo

it's now

X  Y
  D
  A
  T
  V
  Vo

Meaning that we have double the amounts of calculations when we try to figure things out. Also instead of just thinking how fast something is going we have to calculate how fast something is going along with it's direction. A lot of it is very interesting. I learned that if you're on a rail cart going at 10m's and you launch a cannon ball, from a cannon pointed straight up on your cart. Because you and the cannonball are traveling at the same speed, the cannon ball will actually land back into the cannon. Probably killing you and whatever Panaraguan revolutionaries are with you.

http://www.vias.org/physics/bk1_08_01.html