A block \( A \) of mass \( m \) is placed over a plank \( B \) of mass \( 2 \mathrm{~m} \). Plan...

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A block \( A \) of mass \( m \) is placed over a plank \( B \) of mass \( 2 \mathrm{~m} \). Plank \( B \) is placed over a smooth horizontal surface. The coefficient of friction between \( A \) and \( B \) is 0.5 . Block \( A \) is given a velocity \( v_{0} \) towards right. Acceleration of \( B \) relative to \( A \) is
\( B \)
Smooth
(a) \( \frac{g}{2} \)
(b) \( g \)
(c) \( \frac{3 g}{4} \)
(d) Zero
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