user: ### NOW ANSWER:
Question: on August 16, 1963, what is the velocity?
Columns: ['Vehicle Flight #', 'Date', 'Pilot', 'Velocity (km/h)', 'Altitude (m)']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['M2-F1 #0', 'March 1, 1963', 'Thompson', 135.0, 0.0]
SQL:

assistant: SELECT SUM("Velocity (km/h)") FROM "Table" WHERE "Date" = 'August 16, 1963';