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## Homework Statement

An astronaut on a strange planet finds that she can jump a max horizontal distance of 15m if her initial speed is 3m/s. What is the free-fall acceleration on the planet?

## Homework Equations

## The Attempt at a Solution

[tex]2a(x_{f}-x_{i})=v^{2}_{f}-v^{2}_{i}[/tex]

[tex]\frac{2a(15)}{30}=9\\a=-.3m/s^{2}[/tex]

OR

[tex]\Delta x=\frac{v^{2}_{i} sin(2\theta)}{a}\\ \therefore a=\frac{v^{2}}{\Delta x}\\ a=-.6m/s^{2}[/tex]

...Confused :s