A mass \( m \) is attached to a spring. The spring is stretched to ...

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A mass \( m \) is attached to a spring. The spring is stretched to \( \mathrm{x} \) by a force \( \mathrm{F} \) and released. After
P being released, the mass comes to rest at the initial

W equilibrium position. The coefficient of friction, \( \mu_{\mathrm{k}} \), is :-
(1) \( \mu_{\mathrm{k}}=\frac{2 \mathrm{kx}}{\mathrm{mg}} \quad(\stackrel{\sim}{-}) \mu_{\mathrm{k}}=\frac{2 \mathrm{mg}}{\mathrm{F}} \)
(3) \( \mu_{\mathrm{k}}=\frac{F}{2 m g} \)
(4) \( \mu_{\mathrm{k}}=\frac{m g}{2 \mathrm{kx}} \)
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