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At an instant \( \mathrm{t}=0 \), Block \( \mathrm{A} \) of mass \( 1 \mathrm{~kg} \) is moving with speed \( 8 \mathrm{~m} / \mathrm{s} \) towards right on rough
\( \mathrm{P} \) surface of block B of mass \( 3 \mathrm{~kg} \). Block B, which

W is placed on smooth horizontal surface is moving with speed \( 4 \mathrm{~m} / \mathrm{s} \) towards right at same instant \( (t=0) \). The net work done by the frictional force in long time is (block A will not fall from block B)
(1) \( -2 \mathrm{~J} \)
(2) \( -6 \mathrm{~J} \)
(3) \( -4 \mathrm{~J} \)
(4) \( -8 \mathrm{~J} \)
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