ference between them.
15. Three \( 10,000-\mathrm{kg} \) ore cars are held at rest on a \( 26.0^{\circ} \) incline on a mine railway using a cable that is parallel to the incline (Fig. 17-23). The cable is observed to stretch 14.2 cm just before a coupling breaks, detaching one of the cars. Find (a) the frequency of the resulting oscillations of the remaining two cars and (b) the amplitude of the oscillations.
FIGURE 17-23. Exercise 15.