Carts \(A\) and \(B\) are identical and are moving toward each other on a track. The speed of cart A is \(v\), while the speed of cart B is \(2 v\). In the Earth reference frame, the system of the two carts has kinetic energy \(K\). Is there any other reference frame in which the two-cart system has the same kinetic energy \(K\) ? If so, describe this reference frame. Otherwise, explain why no such reference frame exists.