Chapter 3, Problem 44AP

Vectors $\stackrel{\to }{A}$ and $\stackrel{\to }{B}$ have equal magnitudes of 5.00. The sum of $\stackrel{\to }{A}$ and $\stackrel{\to }{B}$ is the vector $6.00\hat{j}$. Determine the angle between $\stackrel{\to }{A}$ and $\stackrel{\to }{B}$.