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Homework Help: Fundamentals of Physics Question 54

  1. Aug 31, 2014 #1
    1. The problem statement, all variables and given/known data

    A stone is dropped into a river from a bridge 47.0 m above the water. Another stone is thrown vertically down 1.48 s after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone?

    2. Relevant equations

    3. The attempt at a solution

    What I'm not understanding is how to find the initial velocity of the first stone. I'm pretty sure you need that to figure out the initial speed of the second stone. At first I thought I needed to do 47/1.48s but when I did that I realized I didn't understand what that number would even represent. I know that I need an equation that will give me the time for both stones.
    Last edited: Aug 31, 2014
  2. jcsd
  3. Aug 31, 2014 #2


    User Avatar

    Staff: Mentor

    When something is "dropped" it is assumed to be released from rest. When something is "thrown" it is given some initial velocity.
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