A plank with a box on it at one end is gradually raised about the other end. As the angle of inc...

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A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches \( 30^{\circ} \), the box starts to slip and slides \( 4.0 \mathrm{~m} \) down the plank in \( 4.0 \mathrm{~s} \). The coefficients of static and kinetic friction between the box and the plank will be, respectively:

a. \( 0.4 \) and \( 0.3 \)
b. \( 0.6 \) and \( 0.6 \)
c. \( 0.6 \) and \( 0.5 \)
d. \( 0.5 \) and \( 0.6 \)
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