Question: Consider the same initial system of spring and carts (A) and B as in Problem 62. After the system is set in motion with common

Consider the same initial system of spring and carts $A$ and B as in Problem 62. After the system is set in motion with common speed $v_{i}$, the clamp is again released. What is the speed of cart $A$ at the instant when the spring is still partially compressed and stores one-fourth of its initial internal energy $E_{\text {spring }}$ ?

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