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In both the figure all other factors are same, except that in figure (i) AB is rough and BC is smooth while in figure (ii) AB is smooth and BC is rough. The kinetic energy of the ball on reaching the bottom
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Is greater in case (i)
In case (i) work done by friction is zero, while in case (ii) it is non-zero as it will forward slip (may be for some time) on BC.
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