# One-D Kinematic Question w/ rising hot air balloon

1. Sep 6, 2012

### millergc

1. The problem statement, all variables and given/known data

A hot-air balloon has just lifted off and is rising at a constant rate of 2.3m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 14m/s.

If the passenger is 2.5m above her friend when the camera is tossed, how high is she when the camera reaches her.

2. Relevant equations

Constant linear acceleration equations

v=v(i) +a*t
x=x(i) + v(i)t + 1/2at^2

3. The attempt at a solution

The part of this problem that confuses me is the acceleration of the camera. I know that the acceleration of the balloon is just -9.8 but how can I find the acceleration of the camera without time, etc. I tried solving where x(balloon)= x(camera) but i used -9.8 as the acceleration for both and i do not believe i got the right time.

Any help would be great.
Thanks.

2. Sep 6, 2012

### Staff: Mentor

The acceleration of the camera is the same as any other body in free fall.
No. You are told that the balloon is rising at a constant rate--so what must be its acceleration?

3. Sep 6, 2012

### millergc

zero, ok i understand, i just thought -g would still act on the balloon but it wouldn't

Thanks