samples/04_physics_and_collisions/10_collision_with_object_removal/app/vector2d.rb
#returns a vector multiplied by scalar x
#x [float] scalar
returns a vector multiplied by scalar x
x [float] scalar
returns a vector multiplied by scalar x x [ float ] scalar
def mult x
    r = Vector2d.new(0,0)
    r.x=@x*x
    r.y=@y*x
    r
  end
def mult x r = Vector2d . new ( 0 , 0 ) r . x = @x * x r . y = @y * x r end
returns a vector multiplied by scalar x
x [float] scalar
returns a vector multiplied by scalar x x [ float ] scalar
x