A ball connected with string is released at an angle \( 45^{\circ} \) with the vertical as shown...

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A ball connected with string is released at an angle \( 45^{\circ} \) with the vertical as shown in the figure. Then, the acceleration of the box at this instant will be (mass of the box is equal to mass of ball)
(a) \( \frac{g}{4} \)
(b) \( \frac{g}{3} \)
Smooth
(c) \( \frac{g}{2} \)
(d) \( g \)
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