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Homework Help: Projectile: Vertical height

  1. Sep 1, 2011 #1
    1. The problem statement, all variables and given/known data

    A baseball is thrown with an initial velocity of 20 ms at an angle of 30 degrees with the horizontal. How high did it go if it was released and caught 2 meters from the ground?


    2. Relevant equations



    3. The attempt at a solution

    0=Vi^2 + 2ad
    0=(20Sin30)2 + 2 X (-9.8)d
    19.62d=100
    d=100/19.62
    d=5.0m, but this is wrong.... Would I mabey need to add 2m to my answer beacuse it is projected from a 2m height? therefore it will go 7m??
     
  2. jcsd
  3. Sep 1, 2011 #2

    PeterO

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    Homework Helper

    Adding the 2 would be a very good idea , yes

    EDIT: you did round off quite a bit to get 5.0m too. That is the answer you get if you take g = 10
     
  4. Sep 1, 2011 #3
    I know... I got 5.10m, whihc would give 7.1m..... I think my teacher sometimes uses 10 or 9.81 depends what kind of day it is ;-), lol
     
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