A small block starts slipping down from a point B on an inclined plane AB, which is making an angle with the horizontal. section BC is smooth and the remaining section CA is rough with a coefficient of friction . It is found that the block comes to rest as it reaches the bottom (point A) of the inclined plane. If BC = 2AC, the coefficient of friction is given by . The value of k is ___________
Option: 1 1
Option: 2 2
Option: 3 3
Option: 4 4
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