A block of mass \( 2 \mathrm{~kg} \) slides down an incline plane o...

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A block of mass \( 2 \mathrm{~kg} \) slides down an incline plane of inclination \( 30^{\circ} \). The coefficient of friction between block and plane is \( 0.5 \). The contact force between block and plank is :
\( \mathrm{P} \)
(A) \( 20 \mathrm{Nt} \)
(B) \( 10 \sqrt{3} \mathrm{Nt} \)
(C) \( 5 \sqrt{7} \mathrm{Nt} \)
(D) \( 5 \sqrt{15} \mathrm{Nt} \)
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