Friction between plane and object

In the above diagram, a box with mass \( m_{1} (= 8 \text{ kg} \)) is on a slope with \( 60^{\circ} \) inclination. This box is connected with another box with mass \( m_{2} (= 13 \text{ kg} \)) by a wire on a frictionless pulley. What is the magnitude of the acceleration of the two boxes when the coefficient of kinetic friction between the first box \(( 8 \text{ kg} )\) and the slope is \( 0.2?\)

Gravitational acceleration is \( g=10\text{ m/s}^{2}. \)

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