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Question

A body is sliding down an inclined plane having coefficient of friction 0.5.  If the normal reaction is twice that of the resultant downward force along the incline, the angle between the inclined plane and the horizontal is
 


  1. 15o

  2. 30 o

  3. 45 o

  4. 60 o


Solution

The correct option is C

45 o


Resultant download force along the incline
=mg(sin θμ cosθ)
Normal reaction =mg cos θ
Given: mg cosθ=2mg(sinθμ cosθ)
By solving θ=45o.

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