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Homework Help: Projectile motion from the ground

  1. Sep 1, 2015 #1
    1. The problem statement, all variables and given/known data

    The problem (5.9) and given data is attached.

    2. Relevant equations
    All relevant equations are given (5.9).

    On (5.9) What does the s subscript y represent? And why does gravity equal -32?

    3. The attempt at a solution
    The solution is given. This is a scan problem.
     

    Attached Files:

  2. jcsd
  3. Sep 1, 2015 #2

    gneill

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    Staff: Mentor

    They are using the variable s to represent distance (This is a common practice in some texts). So ##s_y## would be the distance in the "y" (vertical) direction. ##32 ft/s^2## is the gravitational acceleration using feet rather than meters for distance.
     
  4. Sep 1, 2015 #3
    Thank you gneill. Is the distance in the "y" vertical direction 0 because its final position is the ground?
     
  5. Sep 1, 2015 #4

    gneill

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    Staff: Mentor

    It's 0 at the beginning and end of the trajectory, both at ground level.
     
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