Blocks shown in figure have equal masses m each. The system is released from rest with the spring unstretched. The string between A and ground is cut when there is maximum extension in the spring.The acceleration of centre of mass of the system of two blocks immediately after the string is cut is

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\frac{g}{2}

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zero

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Solution

The correct option is A g
The system is released from rest with the spring unstretched.
The string between A and ground is cut.
The acceleration of the centre of mass of the system of two blocks immediately after the string $= g$

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A block of mass 2 $M$ is attached to a massless spring with spring constant $k$ . This block is connected to two other blocks of masses $M$ and $2 M$ using two massless pulleys and strings. The accelerations of the blocks are $a_{1}, a_{2}$ and $a_{3}$ as shown in the figure. The system is released from rest with the spring in its unstretched state. The maximum extension of the spring is $x_{0}$ . Which of the following option(s) is/are correct?
[ $g$ is the acceleration due to gravity. Neglect friction]