Problem
1. Write a program to implement the simulation of a bouncing ball.
2. Write a program to implement the motion of a bouncing ball using a downward gravitational force and a ground-plane friction force. Initially, the ball is to be projected into space with a given velocity vector.
3. Write a program to implement the two-player pillbox game. The game can be implemented on a flat plane with fixed pillbox positions, or random terrain features and pillbox placements can be generated at the start of the game.