A body of mass m= 0.8 kg moves up along a plane inclined at an angle α=30° to the horizon. A spring of stiffness k = 120 N/m is attached to the body, to which a force F is applied (see figure). The coefficient of friction between the body and the plane is μ = 0.4. The acceleration of the body is 1.2 m/s2. Determine the spring deflection.
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