[填空题]
A high diver leaves t:lb*na iim b)+5f gt4uheuvr1js :+b9;bi/rb5 9;8acuz i9 lf( iv pivzv end of a $5.0-\mathrm{m}$ -high diving board and strikes the water 1.3 s later, 3.0 m beyond the end of the board. Considering the diver as a particle, determine
( a ) her initial velocity, $ \overrightarrow{\mathbf{v}}_{0}$ , ${ }^{\circ} \text { above the horizontal }$
(b) the maximum height reached,
(c) the velocity $ \overrightarrow{\mathbf{v}}_{\mathrm{f}}$ with which she enters the water. $^{\circ} $ $\text { (below the horizontal) }$
