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Initialy spring is in the natural length...

Initialy spring is in the natural length and blocks `A & B` are at rest. Find maximum value of constant force `F` that can be applied on `B` such that block `A` remains at rest. `(g = 10 m//s^(2))` (given answer in Newton)

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The correct Answer is:
3
Initially spring ……………..
Values of `mu mg` for A and B are `2N & 2N` Worck energy theorm on `B` gives
`Fx-2x-(K//2)x^(2)=0`
`F=2+kx//2` ……(i)
For equilibrium of `A kx = mu mg = 2`
so `F = 2+1=3N`
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