Charge your tablet carefully

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A \(1 \text{ kg}\) tablet with dimensions \(30 \text{ cm} \times 30 \text{ cm}\) sits charging on a smooth table. The charging cord is attached to one of its corners. Somebody trips on the cord, applying a force of \(15 \text{ N}\) to the tablet in the direction shown.

What is the initial acceleration at point \(A\) in \(\text{m/s}^2?\)

Assume that tablet has uniform mass.

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