How High is the Apartment House from Which Balloons Were Dropped?

[Palmtree Panic]

Homework Statement

You and your friend throw balloons ¯lled with
water from the roof of a several story apart-
ment house. You simply drop a balloon from
rest. A second balloon is thrown downward
by your friend 3:8 s later with an initial speed
of 74:48 m=s. They hit the ground simultane-
ously.
The acceleration of gravity is 9:8 m=s2 : You
can neglect air resistance.
How high is the apartment house? Answer
in units of m.

Homework Equations

idk

The Attempt at a Solution

too many wrong attempts

 

[hage567]

too many wrong attempts

Show us one, so we can see what you're thinking.

 

[Palmtree Panic]

Or you could just give me the answer.

 

[hage567]

No, I can't. That's against forum rules. We aren't a homework service. You must do the work, we can only guide you.

 

[Palmtree Panic]

I do not know what equation to use. Can someone help me with that?