CREATE TABLE table_16439764_1 (m_v_ft_s INT, max_height__ft_ VARCHAR)

How many feet per second does a shell move where the height range is 23500?
SELECT MIN(m_v_ft_s) FROM table_16439764_1 WHERE max_height__ft_ = 23500
SELECT MIN("m_v_ft_s") FROM "table_16439764_1" WHERE "max_height__ft_" = 23500