What is the length of a mathematical pendulum if the acceleration of its oscillations

What is the length of a mathematical pendulum if the acceleration of its oscillations at the point corresponding to a displacement of 5 cm is previously 0.5 m / s2?

Solution:
F = mgx: I = ma
a = gx: I
I = gx: a = 0.5: 0.5 = 1 m
Answer: 1 m



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