The value for M is 6.81. I know how to do (a) but am unsure how to do (b). Pleas

Question

The value for M is 6.81. I know how to do (a) but am unsure how to do (b). Please help

9.3. Two objects of mass M = [03] _______ kg and mass m = 2.38 kg are at rest on a flat frictionless surface. An ideal spring (k = 51.6 N/m) is placed between them and they are pushed together compressing the spring. At the compressed position they are held together with a piece if ideal string as in figure (a). The string in then cut and after they have moved apart as in figure (b), M has a speed V of 0.472 m/s. (a) What is the magnitude of the velocity v (m/s) of mass m? (b) How far was the spring compressed (m) ?

Explanation / Answer

In short use conservation of energy to solve part b

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