Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_16439764_1 (m_v_ft_s INTEGER, max_height__ft_ VARCHAR)
### Question:
How many feet per second does a shell move where the height range is 23500?
### Answer:
SELECT MIN(m_v_ft_s) FROM table_16439764_1 WHERE max_height__ft_ = 23500