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JEE Main2013PhysicsLaws of MotionActual

A body starts from rest on a long inclined plane of slope 45^ . The coefficient of friction between the body and the plane varies as =0.3 x , where x is distance travelled down the plane. The body will have maximum speed (for g=10 ~m / s ^2 ) when x=

Options

  1. A9.8 ~m
  2. B27 ~m
  3. C12 ~m
  4. D3.33 ~m

Correct answer

D. 3.33 ~m

Step-by-step solution

When the body has maximum speed then aligned & =0.3 x = 45^ & x =3.33 ~m aligned

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