find the vector v that has a magnitude of 4 and is in the same direction of u, where u=

Question

find the vector v that has a magnitude of 4 and is in the same direction of u, where u=<5,-1>

loser66 · Answer

@e.mccormick

e.mccormick · Answer

Have you done anything with normalizing vercors to get the unit length?

loser66 · Answer

@e.mccormick what do you get? the answer?

loser66 · Answer

take time, friend,

e.mccormick · Answer

$4\frac{\vec{u}}{\|\vec{u}\|}$ by finding the normalized version of the vector, you have the same direction and in a unit vector.  Then multiply that by 4 units.

loser66 · Answer

yes, I am with you.

e.mccormick · Answer

100?
$$\frac{4}{\sqrt{5^2+(-1)^2}}(5,-1) \implies \left(\frac{20}{\sqrt{26}}, -\frac{4}{\sqrt{26}} \right) $$

e.mccormick · Answer

And don't forget the - there.

loser66 · Answer

ok, you are right, my bad.

anonymous · Answer

thanks you guys but i got the answer! lololol.

e.mccormick · Answer

Hehe.  We were just discussing it after the fact. =)

And as long as you know the process, you should be able to solve any of them.

loser66 · Answer

@BeautyQueen327 glad to hear it, but it doesn't relate to that any more, we discuss to study, too.

anonymous · Answer

ok ok sorry