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Find the Angle Between Vectors

CLMECH-4YFL3W

Find the approximate value of constant b so that vectors $\vec{u} = 4.0\hat {j}$ and $\vec{v} = 2.0\hat {i}+ b\hat {j}$ form an angle of 55°.

A

$-2.8$

B

$-1.4$

C

$1.4$

D

$2.8$