题目

Good news! During the National Day holiday, there are some promotions（优惠）in Wanda Cinema. This film festival lasts ten days (Sunday, September 30th, 2018 ---Tuesday, October 9th, 2018). Here is the poster.FilmHello, Mrs MoneyProject GutenbergRiver of SorrowShadowPrice￥70￥80(50% off for students )￥50￥70DateSep. 30thOct. 1stOct. 3rdOct. 1stOct. 3rdOct. 5thSep. 30thOct. 1stOct. 4thOct. 2ndOct. 4thOct. 5thTime9:00 a.m.4: 30 p.m. 8: 20 p.m.10:00 a.m.7:10 p.m.9:30 p.m.9:20 a.m.3: 10 p.m.5: 30 p.m.7:50 a.m.9:50 a.m.11:50 a.m.Tips50% off on Thursday for all. Free for children under 6 y全国中学生足球赛在足球广场揭幕．比赛时，一学生用100N的力将质量为0．5kg的足球以8 m/s的初速度沿水平方向踢出20m远，则该学生对足球做的功至少为A．200J B．16J C．1000J D．2000J