Jalga sekundis, tähis ft∙s-1, on kiiruse mõõtühik, mis näitab, mitu pikkusühikut, jalga, läbitakse ajaühikus, sekundis. 1 jalga sekundis = 0,304 8 m/s, 0,681 8 miili tunnis, ja 1,097 28 km/h. Jalga sekundis on endine mõõtühik, mille kasutus on harvaesinev.
The foot per second (symbol ft∙s-1) is a unit of both speed (scalar) and velocity (vector quantity, which includes direction), and it expresses the distance in feet (ft) traveled or displaced, divided by the time in seconds (s). The foot per second is a former unit of measurement that is rarely used.
