1.

Two forces \[{{\vec{F}}_{1}}=5\hat{i}+10\hat{j}-20\hat{k}\]and \[{{\vec{F}}_{2}}=10\hat{i}-5\hat{j}-15\hat{k}\] act on a single point. The angle between \[{{\vec{F}}_{1}}\]and \[{{\vec{F}}_{2}}\] is nearly        [AMU 1995]

A.        \[\text{3}0{}^\circ \]      
B.        \[\text{45}{}^\circ \]
C.        \[\text{6}0{}^\circ \]      
D.        \[\text{9}0{}^\circ \]
Answer» C.        \[\text{6}0{}^\circ \]      


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