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

### Instruction:
What is the weight of the shell that reached its maximum height at 40° in 12.6 seconds?

### Inputs:
table_name: table, columns: ['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 Shell (lb) FROM table WHERE Time to ft (m) at 40° (seconds) = 12.6