# Projectile motion from the ground

1. Sep 1, 2015

### Scorry

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.

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2. Sep 1, 2015

### 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.

3. Sep 1, 2015

### Scorry

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

4. Sep 1, 2015

### Staff: Mentor

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