Inside a smooth spherical cavity particle \( A \) can slide freely....

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Inside a smooth spherical cavity particle \( A \) can slide freely. The block having this cavity is moving horizontally with constant acceleration \( a_{0}=10 \mathrm{~m} / \mathrm{s}^{2} \).

The particle is released from its initial position as shown in the figure. The angle \( \theta \) with the vertical, when the particle will have maximum speed with respect to the block is
(a) \( 30^{\circ} \)
(b) \( 45^{\circ} \)
(c) \( 60^{\circ} \)
(d) \( 90^{\circ} \)
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