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प्रश्न
What is the sum of vector `veca = hati - 2hati + hatk, vecb = - 2hati + 4hatj + 5hatk` and `vecc = hati - 6hatj - 7hatk`
विकल्प
`-4hatj + hatk`
`-4hatj - hatk`
zero
`hatk - hati`
MCQ
उत्तर
`-4hatj - hatk`
Explanation:
Sum of vectors = `veca + vecb + vecc`
= `(hati - 2hatj + hatk) + (-2hati + 5hatj + 5hatk) + (hati - 6hatj - 7hatk)`
= `(hati - 2hati + hatj) + (-2hati + 4hatj - 6hatj) + (hatk - 5hatk - 7hatk)`
= `0. hati - 4hatj - hatk`
= `- 4hatj - hatk`
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