A force \( \vec{F}=\hat{i}+4 \hat{j} \) acts on block shown. The force of friction acting on the...

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A force \( \vec{F}=\hat{i}+4 \hat{j} \) acts on block shown. The force of friction acting on the block is
(a) \( -\hat{i} \)
(b) \( -1.8 \hat{i} \)
(c) \( -2.4 \hat{i} \)
(d) \( -3 \hat{i} \)
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