Answer:
1.2 s
Step-by-step explanation:
The period of a pendulum is the time it takes to complete one cycle, as in move and return to its initial state, for example going from one side to the other and coming back. If this pendulum goes from one side to the other in 0.6 s, it will take it the doble of that time to perform a cycle, and that is the period
T = 2 * 0.6 s = 1.2 s