# A hot air balloon has just lifted off and is rising at the constant

1. Oct 10, 2011

### nc1617

1. The problem statement, all variables and given/known data
A hot air balloon has just lifted off and is rising at the constant rate of 1.6 m/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 10.8 m/s. If the passenger is 2.5 m above her friend when the camera is tossed, how high is she when the camera reaches her?

2. Relevant equations
i tried using constant acceleration equations but they made no sense :(

3. The attempt at a solution
its 2.8 something... but i just really want to know how to set up the problem!
Thanks

2. Oct 10, 2011

### WJSwanson

Re: help

Since you have a constant acceleration due to gravity for the camera, a known initial velocity both objects, and a known initial position (of 0 for the camera and 2.5m for the balloon) and all of your motion is in the same dimension (vertical), you can set use the kinematic equations for one-dimensional motion to find out what height the camera reaches the gal in the balloon.

(Try setting the final position of the camera & the balloon equal to each other, which will let you set the equations for the different objects equal to each other.)