Question

6. Sabendo que | u |= 2 ,| w |= 4 e (u,w) = 60°

Answer 1

a)

|u|=2

|w|=4

|u+w|=|u|+|w|

|u+w|=2+4=6

b)

$Proj(u, w) =(\frac{u.w}{w.w}).w$

$Proj(u,w) =\frac{2.4.\cos(60)}{4.4}.4$

$Proj(u,w) =1$

c)

$u.u++u.w= 2.2+2.4\cos(60) \\ 4+4=8$