The spring-block system shown (Figure 5.121) is in equilibrium. The string connecting blocks $A$ and $B$ is cut. The mass of all three blocks is $m$ each and the spring constant is $k$ . The amplitude of the resulting oscillation of block $A$ is:

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Before the cut the extension is 3 m g / k . After the cut, block A alone gives equilibrium extension m g / k . It is released from rest at the old extension, so the amplitude is 3 m g / k − m g / k = 2 m g / k .

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