A block \( A \) of mass \( 45 \mathrm{~kg} \) is placed on another block \( B \) of mass \( 123 ...

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A block \( A \) of mass \( 45 \mathrm{~kg} \) is placed on another block \( B \) of mass \( 123 \mathrm{~kg} \). Now, block \( B \) is displaced by external agent by \( 50 \mathrm{~cm} \) horizontally towards right. During the same time, block \( A \) just reaches to the left end of block \( B \). Initial and final positions are shown in figures. The work done on block \( A \) in ground frame is
(a) \( -18 \mathrm{~J} \)
(b) \( 18 \mathrm{~J} \)
(c) \( 36 \mathrm{~J} \)
(d) \( -36 \mathrm{~J} \)
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