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Height of pier above water- projectile motion

  1. Apr 14, 2012 #1
    1. The problem statement, all variables and given/known data

    A swimmer moving at 1.80m/s, dives off a pier and hits the water 0.80m from the edge of the pier. How high is the pier above the water?


    2. Relevant equations

    dv=1/2*at2
    dh=Vh*Δt
    a=9.8

    3. The attempt at a solution

    dh=0.80m
    Vh=1.80m/s
    dv=?
    t=?

    First started by solving for Δt in the dh=Vh*Δt equation and found that Δt=0.44s

    Then I plugged it into the dv=1/2*at2 equation

    dv=0.97m

    I would like for someone to just verify that my answers are correct and the significant figures are being respected. Thanks in advance!
     
  2. jcsd
  3. Apr 14, 2012 #2

    BruceW

    User Avatar
    Homework Helper

    yep, all correct. very good.
     
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