Physics · 2018
JEE Main · 15 April 2018, Shift 1 · Q3
A given object takes n times more time to slide down a 45° rough inclined plane as it takes to slide down a perfectly smooth 45° incline. The…
A given object takes n times more time to slide down a $\displaystyle 45$° rough inclined plane as it takes to slide down a perfectly smooth $\displaystyle 45$° incline. The coefficient of kinetic friction between the object and the incline is :
Official answer
(2)
$\displaystyle 1-\frac{1}{\mathrm{n}^2}$
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.