After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length $51\mathrm{.}0$ cmcm $.$ The explorer finds that the pendulum completes $109$ full swing cycles in a time of $135$ ss $.$

Part A

What is the magnitude of the gravitational acceleration on this planet?

Express your answer in meters per second per second.

View Available Hint$($s$)$for Part A

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gplanetgplanet $=$