The u p p er half of an in clin ed p lane of inclination theta is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by

The u p p er half of an in clin ed p lane of inclination theta is perf

1.	The u p p er half of an in clin ed p lane of inclination theta is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by
Answer» `2 TAN PHI` `tan phi` `2 sin phi` `2 cos phi` SOLUTION :2 tan `phi`