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Let veca = 2hati + hatj -hatk , vecb = h...

Let `veca = 2hati + hatj -hatk , vecb = hati + 2hatj - hatk , and vecc = hati + hatj - 2hatk ` , be three vectors . A vector in the plane of b and c whose projection an a is of magnitude `sqrt(2//3)` is

A

`2hati + 3hatj - 3hatk`

B

`-2hati - hatj + 5hatk `

C

both are wrong

D

both are correct

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The correct Answer is:
D
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