Two particles having position vectors \[\overrightarrow{{{r}_{1}}}=(3\hat{i}+5\hat{j})\] metres and \[\overrightarrow{{{r}_{2}}}=(-5\hat{i}-3\hat{j})\] metres are moving with velocities \[{{\overrightarrow{v}}_{1}}=(4\hat{i}+3\hat{j})\,m/s\] and \[{{\overrightarrow{v}}_{2}}=(\alpha \,\hat{i}+7\hat{j})\] \[m/s.\] If they collide after 2 seconds, the value of \['\alpha '\] is [EAMCET 2003]

• A.          2   
• B.          4
• C.          6   
• D.          8