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u = 3i+2j v=5i-j a) find the angle between u and v b) find the component of u along v c) find proj_v u

Mathematics
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@jim_thompson5910 I did part a but it came out wrong o.o
Angle: cos(theta)= (u*v)/|u||v|
(u*v) = 17 right?

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Other answers:

u dot v should be 13
you lost a negative sign
hrm. Yeah I added 2 instead of subtracting it.
|u| = sq13 ?
yep
how about |v|
|v| = sq26
correct
so then cos(theta) = 13/(13 sq2)
yep
theta = 45
good
ah k, it was just that 13
component of u along v would be 2.54?
sorry got distracted
let me check
I'm getting 2.5495097567964
did you get about the same?
mhm!
Sorry, I didn't see you had replied.
that's ok I didn't see it earlier too
did you figure out part c)?
Yep I got 5/2i - 1/2 j
I got <2.5, -0.5> which is the exact same
Fantastic :) the form you wrote it in is probably better haha
either way works
oki! thanks :)

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