Give an equation for dx/dt and dy/dt, which determines how the position of each particle changes in the x and y direction, respectively.

• x, y (where the origin is the top left corner)
• Standard mathematical signs (+, -, * /)
• Bitwise operations (|, &, ^, <<, >>)
• Javascript math functions (Math.random(), Math.sin(), Math.cos(), Math.pow(), etc.)
• Plain constant numbers (1, 38274, 243.2342)