Question

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

Answer 1

a) |u+w|=|u|+|w|=2+4=6

b)

$\frac{ |u|. |w| .\cos(60) }{w.w} (w) \\ \frac{ 2.4. \frac{1}{2} }{4.4} .4 = 1$

c)

$u.u + u.w \\ = 2.2 + 2.4 \\ = 4 + 8 = 12$