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The idea of \"mass/spring constant\" have further use while L/g is merely I/mgd for point mass also both are approximates F=dp/dt always holds in relativity 1/2mv^2 and mv are non-rel approximates every angular is worse than linear version x0 v0 θ0 ω0 have too much ugly integration constants
Credit to https://secure-media.collegeboard.org/digitalServices/pdf/ap/ap-physics-1-equations-table.pdf for the images.
