Buses \( A \) and \( B \) are moving in the same direction with velocities \( 20 \hat{\mathbf{i}...

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Buses \( A \) and \( B \) are moving in the same direction with velocities \( 20 \hat{\mathbf{i}} \mathrm{ms}^{-1} \) and \( 15 \hat{\mathbf{i}} \mathrm{ms}^{-1} \), respectively. Then, relative velocity of \( A \) w.r.t. \( B \) is
(a) \( 35 \hat{\mathbf{i}} \mathrm{ms}^{-1} \)
(b) \( 5 \hat{\mathbf{i}} \mathrm{ms}^{-1} \)
(c) \( 5 \hat{\mathbf{j}} \mathrm{ms}^{-1} \)
(d) \( 35 \hat{\mathbf{j}} \mathrm{ms}^{-1} \)
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