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प्रश्न
Find a vector in the direction of `bara = hati - 2hatj` that has magnitude 7 units.
उत्तर
`bara = hati - 2hatj`
`therefore |bara| = sqrt(1^2 + (- 2)^2) = sqrt5`
Unit vector in direction of `bara = hata = bara/|bara|`
= `(hati - 2hatj)/sqrt5`
∴ Vector of magnitude 7 in the direction of `bara = 7hata`
= `7((hati - 2hatj)/sqrt5)`
= `7/sqrt5 hati - 14/sqrt5 hatj`
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