Save the other two .

In the figure three $10,000 kg$ ore cars are held at rest on a mine railway using a cable that is parallel to the rails, which are inclined at angle $\theta= 30°$ . The cable stretches $15 cm$ just before the coupling between the two lower cars breaks, detaching the lowest car. Assuming that the cable obeys Hooke's law , find the amplitude (in $cm$ ) of the resulting oscillations of the remaining two cars.

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