If a unit vector is represented by \( 0.5 \hat{i}-0.8 \hat{j}+c \ha...

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If a unit vector is represented by \( 0.5 \hat{i}-0.8 \hat{j}+c \hat{k} \),
P then the value of ' \( c \) ' is:

W
(1) 1
(2) \( \sqrt{0.11} \)
(3) \( \sqrt{0.01} \)
(4) \( \sqrt{0.39} \)
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