The upper half of an in clin ed plane of inclination 30^(@) is perfectly smooth, while the lower half is rough. A block starts from rest from the top of the plane and if it comes back to rest at the bottom, what is the co-efficient of kinetic friction between the surface of block and the rough surface of the inclined plane ?

The upper half of an in clin ed plane of inclination 30^(@) is perfect

1.	The upper half of an in clin ed plane of inclination 30^(@) is perfectly smooth, while the lower half is rough. A block starts from rest from the top of the plane and if it comes back to rest at the bottom, what is the co-efficient of kinetic friction between the surface of block and the rough surface of the inclined plane ?
Answer» 2 `2sqrt(3)` `(2)/SQRT(3)` `sqrt(3)` SOLUTION :ACCORDING to Textual ExerciseSection - Bsameas SUM No.9