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In the figure shown, there is no friction between \( B \) and ground and \( \mu=2 / 3 \) between \( A \) and \( B \).
(a) The net work done on block \( A \) with respect to \( B \) is zero
(b) The net work done on block \( A \) with respect to ground for a displacement \( S \) is \( M g S / 3 \)
(c) The net work done on block \( B \) with respect to ground for a displacement \( S \) is \( 2 M g S / 3 \)
(d) The work done by friction with respect to ground on \( A \) and \( B \) is equal and opposite in sign.
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