While competing in the long jump, a person leaps over a smooth horizontal sand surface. She lands on the surface with speed vf = 8.75 m/s at an angle θ = 31.5° below horizontal. Assume that the person moves without air resistance. Use a Cartesian coordinate system with the origin at her final position. The positive x-axis is directed from her initial to her final position, and the positive y-axis is directed vertically upwards.