Projectile motion from the ground

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Homework Help Overview

The discussion revolves around a projectile motion problem, specifically focusing on the interpretation of variables and the effects of gravity in a given context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the meaning of the variable s subscript y, questioning its representation of vertical distance. They also discuss the significance of gravitational acceleration being -32 ft/s² and its implications for the problem.

Discussion Status

Some participants have provided clarifications regarding the use of variables and the nature of gravitational acceleration. Questions remain about the vertical distance at different points in the projectile's trajectory, particularly at the ground level.

Contextual Notes

There is an emphasis on understanding the initial and final positions of the projectile being at ground level, which may influence interpretations of distance in the vertical direction.

Scorry
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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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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.
 
Thank you gneill. Is the distance in the "y" vertical direction 0 because its final position is the ground?
 
Scorry said:
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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