A block of mass \( 4 \mathrm{~kg} \) is placed on a rough \( \mathrm{P} \) horizontal plane A ti...

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A block of mass \( 4 \mathrm{~kg} \) is placed on a rough
\( \mathrm{P} \) horizontal plane A time dependent force \( \mathrm{F}=\mathrm{kt}^{2} \)

W. acts on the block, where \( \mathrm{k}=2 \mathrm{~N} / \mathrm{s}^{2} \). Coefficient of friction \( \mu=0.8 \). Force of friction between block and the plane at \( \mathrm{t}=2 \mathrm{~s} \) is :-
(1) \( 8 \mathrm{~N} \)
(2) \( 4 \mathrm{~N} \)
(3) \( 2 \mathrm{~N} \)
(4) \( 32 \mathrm{~N} \)
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