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July 31, 2014

Homework Help: Physics

Posted by mary on Sunday, December 28, 2008 at 12:12am.

A woman on a bridge 90.0m high sees a raft floating at a constant sped 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 6.00m more to travel before passing under the bridge. The stone hits the water 2.00m in front of the raft. Find the speed of the raft.

I made a table with Y:-90m, A:9.8m/s^2, Vo: 0
So since y+ Vot+1/2at^2
90= 0+ (9.8) t^2
T+ 4.29

I figured the raft moves 4.00m.

So

4.00m/4.49s =.89 m/s

But the answer in the back of the book is .932m/s

What did I do wrong?

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