Well, actually she seems to have dropped it from 120 feet up or threw it horizontally.
If she threw it with any initial vertical speed Vi the equation would have been:
y = -16 t^2 + Vi t + 120
16 is about 1/2 of g in English units.
In general
y = -(1/2) g t^2 + Vi t + Hi
BUT
you did not ask any question.
the equation y=-16t2+120 can be used to represent the fruits height above the ground, where t represent time ,in seconds, after she threw the apple
2 answers
Y = 120 - 16t^2 = 0 When the fruit hits gnd.
120 - 16t^2 = 0,
16t^2 = 120,
t = 2.74 s. = Time required for fruit to hit gnd.
120 - 16t^2 = 0,
16t^2 = 120,
t = 2.74 s. = Time required for fruit to hit gnd.