The magnitude of a vector `u = a*i + b*j` , such that:
`|u| = sqrt(a^2+b^2)`
Since the problem provides the magnitude `|v| = 5` , yields:
`5 = sqrt(a^2+b^2)`
The direction angle of the vector can be found using the formula, such that:
`tan theta = b/a`
Since the problem provides the information that the direction angle of the vector v coincides to the direction angle of the vector `u = <2,5>` , yields:
`tan theta = 5/2 => b/a = 5/2> 5a = 2b => b = (5a)/2`
Replacing `(5a)/2` for b in equation`5 = sqrt(a^2+b^2)` yields:
`5 = sqrt(a^2+25a^2/4)=> 25 = 29a^2/4 => 100 =29a^2 => a = +-10/(sqrt29)`
`b = +-25/(sqrt29)`
Hence, the component form of the vector v can be `<10/(sqrt29),25/(sqrt29)>` or `<-10/(sqrt29),-25/(sqrt29)>.`
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