A block of mass \( m \) is resting on a wedge of angle \( \theta \) as shown in the figure. With...

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A block of mass \( m \) is resting on a wedge of angle \( \theta \) as shown in the figure. With what minimum acceleration a should the wedge move so that the mass \( m \) falls freely?
(a) \( g \)
(b) \( g \cot \theta \)
(c) \( g \cos \theta \)
(d) \( g \tan \theta \)
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