//method to work out damage from blocks?
CollidedWith(Entity theOtherEntity){
    float towardsAccuracy = 0.5f;
    float damage = 0f;
    if(theOtherEntity instanceof Actor
    && ((Actor)theOtherEntity).body.getPosition().sub(body.getPosition).nor().dst(body.getLinearVelocity().nor()) < towardsAccuracy){
        damage = body.getLinearVelocity().length() * body.getMass();
        damage = Math.sqrt(damage); //not sure if this is needed to scale down the damage from being stupidly high?
        ((Actor)theOtherEntity).takeDamage(damage,this);
    }
}