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Question

The spring block system as shown in figure is in equilibrium. The string connecting blocks A and B is cut. The mass of all the three blocks is m and spring constant of both the spring is k. The amplitude of resulting oscillation of block A is 


  1. mgk
  2. 2mgk
  3. 3mgk
  4. 4mgk


Solution

The correct option is B 2mgk
Just after cutting the string, extension in spring = 3mgk
The extension in the spring when block is in mean position =mgk
∴   Amplitude of oscillation 
A = 3mgkmgk =2mgk

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