This class is killing me. Here's my problem: A woman on a bridge 91.0m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 2.70m more to travel before passing under the bridge. The stone hits the water 4.90m in front of the raft. Find the speed of the raft. Ok so the object is to find the speed of the raft. In order to do so, I have to find some variables of the stone. I'm guessing that I need to find the velocity, and time the stone is in the air. Is this correct? If so, then I have no idea on how to start for either of those. To find time I would need to know the velocity and to find the velocity I would need to know the time. Or at least this is my thinking. A little direction to get me started would be greatly appreciated.