The upper half of an inclined plane with inclination is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by :

The upper half of an inclined plane with inclination is perfectly smoo

1.	The upper half of an inclined plane with inclination is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by :
Answer» `2 sinphi` `2 COS phi` `2 tan phi` `tan phi` Solution :For first half of MOTION , `upsilon^(2) = 2 (g sin phi)l` ...(a) For second half of motion `0= upsilon^(2) +2G (sin theta+mu cos phi)l...(b)` Solving (a) and (b) we GET `mu = 2 tan phi` Hence choice is (c).

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The upper half of an inclined plane with inclination is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by :

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