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gomess
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Homework Statement
A 10g marble is launched horizontally from a spring of K = 20 N/m. If the marble ended up with a launch speed of 40m/sec, how much (in cm) was the spring compressed by?
Homework Equations
[itex]F=kx[/itex]
[itex]E=\frac{1}{2}kx^2[/itex]
The Attempt at a Solution
To find how much the spring was compressed by, I know that you must solve for x in either equation. But I am unsure what values F or E would be. F =ma, but no acceleration, displacement, or time interval is given. ΔE= FΔd, but still force is required.