That is, the y-component, which is nothing but the length AB, is

\(\text{AB} = \text{OA} \times \sin 30^{\circ} = 10 \times \sin 30^{\circ}\)

That is, the y-component, which is nothing but the length AB, is

\(\text{AB} = \text{OA} \times \sin 30^{\circ} = 10 \times \sin 30^{\circ}\)