A body takes $1\frac{1}{3}$ times as much time to slide down a rough identical but smooth inclined plane. If the angle of inclined plane is $45^o$, the coefficient of friction is

  • A

    $\frac{7}{16}$

  • B

    $\frac{9}{16}$

  • C

    $\frac{7}{9}$

  • D

    $\frac{3}{4}$

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