A body is moving in a circle at a uniform speed v. What is the magnitude of the change in velocity when the radius vector describes an angle θ ?
1
v cos θ
2
\(2 \mathrm{v} \cos \left(\frac{\theta}{2}\right) \)
3
v sin θ
4
\(2 \mathrm{v} \sin \left(\frac{\theta}{2}\right)\)