हिंदी

If a→=2i^+j^+2k^ and b→=5i^-3j^+k^, find the projection of b→ on a→. - Mathematics

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प्रश्न

If `veca = 2hati + hatj + 2hatk` and `vecb = 5hati - 3hatj + hatk`, find the projection of `vecb` on `veca`.

योग
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उत्तर

Given, `veca = 2hati + hatj + 2hatk` 

And `vecb = 5hati - 3hatj + hatk`

Projection of `vecb` on `veca = 1/|veca|(veca  . vecb)`

`(veca  . vecb)` = (2 × 5) + (1 × (– 3)) + (2 × 1)

= 10 – 3 + 2

= 9

Magnitude of `|veca| = sqrt(2^2 + 1 + 2^2)`

= `sqrt(4 + 1 + 4)`

= `sqrt(9)`

= 3

∴ Required projection = `9/3` = 3

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