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Vertical velocity

  1. Mar 16, 2006 #1
    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. jcsd
  3. Mar 16, 2006 #2

    Hootenanny

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    You do know the final velocity. How fast will the salmon be travelling vertically if it only just reaches the top of the waterfall?
     
  4. Mar 16, 2006 #3
    I guess it would have to be 0 if it only just reaches it. Sorry, i'm not very good with word problems.
     
  5. Mar 16, 2006 #4

    Hootenanny

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    You're right.

    No need to apologise, I like formulae better myself, it's much harder to missinterpret a formula! :smile:
     
  6. Mar 16, 2006 #5
    Thanks for your help :).
     
  7. Mar 16, 2006 #6

    Hootenanny

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    No problem :smile:
     
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