Conservation of Momentum using Unit Vectors (5:29)
A 66.0 g ball is launched from a stationary Nerd-A-Pult on wheels. The total mass of the Nerd-A-Pult on wheels is 1,791 g. If the ball moves with a velocity of -351 i + 179 j cm/s right after launching, what is the velocity of the Nerd-A-Pult right after the ball is launched? This is an AP Physics C: Mechanics topic.
0:00 The Problem
1:30 Why Momentum is Conserved
2:27 Solving the problem
3:45 Solution without Unit Vectors
4:11 Why are these ratios the same?