A rugby player runs with the ball directly toward his opponent's goal, along the positive direction of an $x$ axis. He can legally pass the ball to a teammate as long as the ball's velocity relative to the field does not have a positive $x$ component. Suppose the player runs at speed $4.0 \mathrm{~m} / \mathrm{s}$ relative to the field while he passes the ball with velocity $\vec{v}_{B P}$ relative to himself. If $\vec{v}_{B P}$ has magnitude $7.1 \mathrm{~m} / \mathrm{s}$, what is the smallest angle it can have (relative to the positive direction of the $x$ axis) for the pass to be legal? Number i Units