If a unit vector is represented by 0.5 h...

If a unit vector is represented by `0.5 hat(i) + 0.8 hat(j) + c hat(k)` , then the value of `c` is

A

1

B

`sqrt(0.11)`

C

`sqrt(0.01)`

D

`sqrt(0.39)`

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The correct Answer is:

B

(b) For a unit vector `sqrt((0.5)^(2)+(0.8)^(2)+C^(2))=1`
ON solving ,we get
`c=sqrt(0.11)`

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