Find velocity at a specific time?

[treyh]

Hey guys. I need help figuring out how to do this problem. I have a test tomorrow and i am currently studying. I would like to know how they got this answer. I'm completely stumped and need help so thanks in advance!

Here is the question:

http://img405.imageshack.us/img405/624/physicsv.jpg

Also, if not too much trouble can you help me with part c to this problem?:

(c) How long after it's release does the mailbag reach the ground?

 

[ehild]

Also, if not too much trouble can you help me with part c to this problem?:

(c) How long after it's release does the mailbag reach the ground?

What do you think, how does the mailbag move? At what height does it start? What is its initial velocity?

ehild