Originally Posted by

**bradycat** Hi, Stuck on this one, I have a drawing but it does not make sense.

Is this 1D or 2D kinematics??

a hot air balloon is rising straight up with a speed of 3.0 m/s. A ballast bag is released from rest relative to the balloon when it is 9.5 m above the ground.

How much time elapses before the ballast bag hits the ground.

So I have Vo = 0 m/s as it's from rest relative to the balloon?? is that correct.

a = -9.8 m/ss

d = 9.5 m

Do I use d = Vot + 1/2 at^2. And if so how to do I get the 2 t's into 1. I tried to re arrange and it's not working out.

Please help me start this please, thanks. Tell me if I am on the right track.

Jo