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KVPY2014PhysicsMotion in Two Dimensions

A box when dropped from a certain height reaches the ground with a speed v . When it skides from rest from the same height down a rough inclined plane inclined at in angle 45^ to the horizontal, it reaches the ground with a speed v / 3 . The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is 10 ~ms ⁻² )

Options

  1. A8 9
  2. B1 9
  3. C2 3
  4. D1 3

Correct answer

A. 8 9

Step-by-step solution

Case-1 v= 2 g h Case-2 U+ k E=w_ f array l -m g h+ 1 2 m ( 2 g h 9 )=- m g h = 8 9 array

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