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Laws of Motion question

2018 · 15 Apr · Shift 1 · Q68
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Laws of Motion question

2018 · 15 Apr · Shift 1 · Q68

JEE MainPhysicsLaws of MotionMCQ+4 / −1
A given object takes n times more time to slide down a 45∘{45^ \circ }45∘ rough inclined plane as it takes to slide down a perfectly smooth 45∘{45^ \circ }45∘ incline. The coefficient of kinetic friction between the object and the incline is :
  1. A
    12−n2{1 \over {2 - {n^2}}}2−n21​
  2. B
    1−1n21 - {1 \over {{n^2}}}1−n21​
  3. C
    1−1n2\sqrt {1 - {1 \over {{n^2}}}}1−n21​​
  4. D
    11−n2\sqrt {{1 \over {1 - {n^2}}}}1−n21​​
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