A pendulum clock has a period of 0.650 s on Earth. It is taken to another planet

Question:

A pendulum clock has a period of 0.650 s on Earth. It is taken to another planet and found to have a period of 0.862 s. The change in the pendulum's length is negligible.
(a) Is the gravitational field strength on the other planet greater than or less than that on Earth?
(b) Find the gravitational field strength on the other planet.