Pendulum Word Problem

L. Barnes, Word Problem, Kirkland and 10-16-13

The period of a pendulum is the time the pendulum takes to swing back and forth. The function L= 0.81t^2 relates the length L in feet of a pendulum to the time t in seconds that it takes to swing back and fourth. A convention center has a pendulum that is 120 feet long. Find the period

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