A bag is dropped from a hovering helicopter. The bag has fallen for 2.0 s. What is the bag's velocity? How far has the bag fallen?

The word "dropped" means that the bag is in free fall and that its initial velocity is zero. In a free-falling body, the value of the final velocity is obtained through the equation,

Vf = gt

where g is the acceleration due to gravity, 9.8 m/s².

Substituting,

Vf = (9.8 m/s²) (2 s) = 19.6 m/s

Therefore, the bag's velocity is 19.6 m/s.