Correct me if I am wrong, but the length of the pendulum will be the same weather it is on Earth or Mars. Therefore, what would be the problem with solving for the length given the period on Earth of .80s? After solving for length, a new equation could be made with one unknown, that being the period on Mars.

## Comments

Correct me if I am wrong, but the length of the pendulum will be the same weather it is on Earth or Mars. Therefore, what would be the problem with solving for the length given the period on Earth of .80s? After solving for length, a new equation could be made with one unknown, that being the period on Mars.