Imagine You Are an Astronaut Who Has Landed on Another

Imagine you are an astronaut who has landed on another planet and you want to determine the free fall acceleration on that planet.In one of the experiments you decided to conduct,you use a pendulum 0.50 m long and find that the period of oscillation for this pendulum is 2.15 s.What is the acceleration of gravity on that planet?

A) 9.81 m/s²
B) 4.27 m/s²
C) 2.16 m/s²
D) 1.89 m/s²
E) None are correct.