The answer is as the slope of the line
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To solve this problem we must rely on the equations of the simple harmonic movement that define the period as a function of length and gravity as

Where
l = Length
g = Gravity
Re-arrange to find L,

Our values are given as


Replacing,



Therefore the height would be 25.348m
Asteroids revolve around the sun in groups. There is a belt of them between Mars and Jupiter.