A block of wood resting on an inclined plane of angle $30^o$, just starts moving down. If the coefficient of friction is $0.2$, its velocity (in $ms^{-1}$) after $5\, seconds$ is : $(g = 10\, ms^{-2})$

  • A

    $12.75$

  • B

    $16.34$

  • C

    $18.25$

  • D

    $20$

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