When a model rocket is launched, the propellant burns for a few seconds, accelerating the rocket upward. After burnout, the rocket coasts upward for a while and then begins to fall. A small explosive charge pops out a parachute shortly after the rocket starts down. The parachute slows the rocket to keep it from breaking when it lands. The figure here shows the velocity data from the flight of the model rocket. Use the data to complete parts $($a$)$ through $($g$).$

$($a$)$ How fast was the rocket climbing when the engine stopped?

$$ ft$/$sec

$($Round to the nearest integer as needed.$)$