A:46m2
B:50m2
C:54m2
D:60m2
— They are Mary's bag. She left it on the playground just now, but now she can't find it.
如图,在边长为2的正方形ABCD中,G是AD延长线时的一点,且DG=AD,动点M从A点出发,以每秒1个单位的速度沿着A→C→G的路线向G点匀速运动(M不与A,G重合),设运动时间为t秒,连接BM并延长AG于N.