Projectile motion from the ground

  • Thread starter Scorry
  • Start date
  • #1
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Homework Statement



The problem (5.9) and given data is attached.

Homework Equations


All relevant equations are given (5.9).

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

The Attempt at a Solution


The solution is given. This is a scan problem.
 

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Answers and Replies

  • #2
gneill
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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.
 
  • #3
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Thank you gneill. Is the distance in the "y" vertical direction 0 because its final position is the ground?
 
  • #4
gneill
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Thank you gneill. Is the distance in the "y" vertical direction 0 because its final position is the ground?
It's 0 at the beginning and end of the trajectory, both at ground level.
 

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