Two blocks having masses $m_{1}$ and $m_{2}$ are connected by a thread and are placed on an inclined plane with thread loose as shown in figure. When the blocks are released :

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thread will remain loose if $m_{1} < m_{2}$

thread will remain loose if plane is smooth

thread will remain loose if $m_{1}$ is smooth and $m_{2}$ is rough

thread will remain loose if $m_{1}$ is rough and $m_{2}$ is smooth

answer is B, D.

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Detailed Solution

For smooth plane, both the block will move with same acceleration, and so there is no relative motion between the blocks.

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