Homework Help: Vertical velocity

1. Mar 16, 2006

inner08

In its final trip upstream to its spawning territory, a salmon jumps to the top of a waterfall 1.9m high. What is the minimum vertical velocity needed by the salmon to reach the top of the waterfall?

There seems to be some piece of information missing.
I know that:
a = 9.8 m/s^2
dy = 1.9m

I'm thinking i'll probably be using the formula (Vf^2 = Vi^2 + 2ad) so that would mean I need to have the Vf or the Vi. Would either of these be equal to zero?!

Any help is appreciated!

Thanks,

2. Mar 16, 2006

Hootenanny

Staff Emeritus
You do know the final velocity. How fast will the salmon be travelling vertically if it only just reaches the top of the waterfall?

3. Mar 16, 2006

inner08

I guess it would have to be 0 if it only just reaches it. Sorry, i'm not very good with word problems.

4. Mar 16, 2006

Hootenanny

Staff Emeritus
You're right.

No need to apologise, I like formulae better myself, it's much harder to missinterpret a formula!

5. Mar 16, 2006

inner08

6. Mar 16, 2006

Hootenanny

Staff Emeritus
No problem