[单选题]
13.14: A small ball is throwi+fw )i 4oqreby06 wma v89w2an at )s*g1e*qs/y:i hwtq jdsb 7c ;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.