There is a formula that involves the dot product. So, we need component forms of both vectors. From question 1, we know that u = <2.5, 2>. What is component form of vector v?
What is the dot product of u and v?[br][math]u\cdot v[/math] =
What is the magnitude of v and magnitude of u?
Now apply the formula to find the angle between v and u.