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A wooden block slides down the right ang...

A wooden block slides down the right angle channel as shown in Fig. The channel is inclined at an angle `theta` w.r.t. the horizontal . The angle `alpha` is `45^(@)`, i.e., the channel is oriented symmetrically with the vertical. IF the coefficient of friction between the block and the channel is `mu_(k)`, find the acceleration of the block.

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