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JEEMAIN PAST PAPERS
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1999
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Q)
A body takes $1 \frac{1}{3}$ times as much time to slide down a rough inclined plane as it takes to slide down an indentical but smooth inclined plane. If the angle of inclined plane is $45^{\circ}$, the coefficient of friction is:
( A ) $\frac{9}{16}$
( B ) $\frac{7}{16}$
( C ) $\frac{3}{4}$
( D ) $\frac{7}{9}$
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