code: public SteeringAcceleration<T> mulAdd (SteeringAcceleration<T> steering, float scalar) {
  		linear.mulAdd(steering.linear, scalar);
  		angular += steering.angular * scalar;
  		return this;
  	}
docs: First scale a supplied steering acceleration, then add it to this steering acceleration.
  
  @param steering the steering acceleration
  @param scalar the scalar
  @return this steering acceleration for chaining