[填空题]
A 0.40-kg ball is thrown with a s)eh :r+tj0u-(afd t azg .0qncpeed o*p nh: 8m*wobmmrzl.xjea7 e( 8zd2b+f 12 m/s at an angle of 33 $^{\circ} $. (a) What is its speed at its highest point m/s
(b) how high does it go? (Use conservation of energy, and ignore air resistance.) m