The upper half of an inclined plane of inclination  is perfectly smooth while the lower…

Physics · NEET · NTA ExamsLaws of Motion

The upper half of an inclined plane of inclination is perfectly smooth while the lower half is rough. A body starting from the rest at top comes back to rest at the bottom if the coefficient of friction for the lower half  is given by
  [Pb. PMT 2000; NEET 2013]
  1. = sin
  2. = cot
  3. = 2 cos
  4. = 2 tan

Answer

(D)  = 2 tan 

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