Speed of mailbag dropped from descending helicopter after 4 seconds

[stumphead101]

Homework Statement

A small mailbag is released from a helicopter that is descending steadily at 2.68 m/s.
(a) After 4.00 s, what is the speed of the mailbag?
v = ?

Homework Equations

The Attempt at a Solution

 

[wukunlin]

i think you can assume that the mail bag has an initial velocity identical to that of the helicopter.

Once it has been released in midair, it will start accelerating at 9.81 m/s^2 to earth, the calculation becomes trivial