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A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches , the box starts to slip and slides down the plank in . The coefficients of static and kinetic friction between the box and the plank will be, respectively:
image

  1. A
    and
  2. B
    and
  3. C
    and
  4. D
    and

Solution & Step-by-step Explanation

1. Static friction: .2. Kinetic friction: Using :.Acceleration ...

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A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches , the box starts to slip and slides down the plank in . The coefficients of static and kinetic friction between the box and the plank will be, respectively:
image
A
and
B
and
C
and
D
and

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