Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many feet per second does a shell move where the height range is 23500?

### Inputs:
table_name: table, columns: ['Gun', 'm/v ft/s', 'Shell (lb)', 'Time to ft (m) at 25° (seconds)', 'Time to ft (m) at 40° (seconds)', 'Time to ft (m) at 55° (seconds)', 'Max. height (ft)']

### Response:
SELECT MIN m/v ft/s FROM table WHERE Max. height (ft) = 23500