Two cars collide head-on on a busy street. An observer standing on the street witnesses the accident and calculates how much of the cars' initial kinetic energy went into deforming the cars upon collision, \(E_{\text {def }}\). A police officer was driving next to one of the cars at a matching speed when the cars collided. Would this officer calculate a higher value of \(E_{\text {def }}\) a lower value of \(E_{\mathrm{def}}\), or the same value of \(E_{\text {def }}\) if he used the velocities of the cars measured in his reference frame?