• public final class Vector2 extends java.lang.Object

• public final class Vector2 { private double x; private double y; private String name;
• Q1
• 

public double mag () Returns the magnitude of this vector. Returns: the magnitude of this vector. public static Vector2 subtract (Vector2 a, Vector2 b) Returns a new Vector2D equal to a b. Parameters: a vector la b - another vector Returns: la new Vector2D equal to a - b public static Vector2 dirvector (double theta) Returns the vector having magnitude one pointing in the direction theta degrees from the x axis. The components of the vector are equal to (Math.cos (rad), Math.sin(rad)) where rad is theta expressed in radians. Parameters: theta - the direction that the vector is pointing in measured in degrees from the x axis Returns: the unit vector pointing in the given direction