Hi i have a problem. My physics teacher tells us that a longitudinal wave moving on a spring has speed v=(kL/u)^2 where k is spring constant n L e length of spring u=m/L of that spring.. which i think its unbelievable but the teacher told me its true.. I think the speed of e wave got nothing to do with spring's length.. Which this equation indicates that if u just use a spring 2 times longer, the speed of the wave will be 2 times faster.. which is unbelievable.. Am I wrong or what? Thank you for all ur help!