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Find unit vector in direction of friction force acting on block. \( \overrightarrow{\mathrm{v}}_{P}=7 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}, \quad \overrightarrow{\mathrm{v}}_{B}=3 \hat{\mathrm{i}}+\hat{\mathrm{j}} \)
\( \mathrm{P} \)
\( \mathrm{W} \)
(1) \( -\frac{4}{5} \hat{i}+\frac{3}{5} \hat{j} \)
(2) \( \frac{4}{5} \hat{i}-\frac{3}{5} \hat{j} \)
(3) \( \frac{-4 \hat{i}-3 \hat{j}}{5} \)
(4) \( \frac{4 \hat{i}+3 \hat{j}}{5} \)
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