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Initially the blocks are at rest with F=...

Initially the blocks are at rest with `F=0`. `F` is gradually increased.

From `F=0` till `F=F_(1)`, no motion
From `F gt F_(1)` till `F=2F_(1)`, motion with relative acceleration `=0`
From ` F gt 2F_(1)`, relative acceleration non-zero
At `F=3F_(1)`, relative acceleration `= 2 ms ^(-2)`
Then,

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