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Consider a rectangular block of wood moving with a velocity \( v_{0} \) in a gas at temperature \( T \) and mass
\( \mathrm{P} \) density \( \rho \). Assume the velocity is along \( x \)-axis and

W the area of cross-section of the block perpendicular to \( v_{0} \) is \( A \). The drag force on the block is (where \( m \) is the mass of the gas molecule.)
(a) \( 4 \rho A v_{0} \sqrt{\frac{k T}{m}} \)
(b) \( 2 \rho A v_{0} \sqrt{\frac{k T}{3 m}} \)
(c) \( \frac{\rho A}{2 v_{0}} \sqrt{\frac{k T}{m}} \)
(d) \( \frac{v_{0}}{\rho A} \sqrt{\frac{k T}{2 m}} \)
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