[Solved] Get speed from vector using box2d and javascript

Tommy Otzen Asks: Get speed from vector using box2d and javascript
I need to find the speed of an object in a game. The game is made in HTML5 with jquery and jquery.box2d. For this I can use these methods:

Code:
 GetLinearVelocity().x;
 GetLinearVelocity().y;

I’m then trying to calculate the speed from this piece of code, but get some values that doesn’t make sense when I console.log it. This is my code:

Code:
 var heroVelX = game.currentHero.GetLinearVelocity().x;
 var heroVelY = game.currentHero.GetLinearVelocity().y;

 var speed = Math.sqrt(heroVelX^2 + heroVelY^2);
 console.log(speed);

Some of the values in console.log are numbers, but most of them are NaN (Not-A-Number), which confuses me? Can someone help me solve this?

The goal I want to achieve, is to see when the speed(of object .currenHero) drop below a certain value, so I can excute a new state in the game.

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