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A block is moving along \( y \)-axis with velocity \( \vec{v}_{\mathrm{A}}=4 \hat{\mathrm{j}} \) on a plank relative to ground and the plank is moving along \( \mathrm{x} \)-axis with velocity \( \vec{v}_{p}=3 \hat{i} \) at any instant of time. The unit vector in direction of friction force acting on block at this moment is :-
(1) \( \frac{3 \hat{i}+4 \hat{j}}{5} \)
(2) \( \frac{3 \hat{i}-4 \hat{j}}{5} \)
(3) \( \frac{-3 \hat{i}+4 \hat{j}}{5} \)
(4) \( \frac{-3 \hat{i}-4 \hat{j}}{5} \)
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