[单选题]
13.14: A small ball ibzh6cf i904 k7u2h pu mglq50cs t,e7ctfok x.ej:pc n98f-)wl j hrown at an angle of $30.0^{\circ}$ above the horizontal ground with a speed of 20 m/s. To what maximum height above the launch point does the ball rise during its motion? Ignore air resistance.