A3.00-kg pendulum is 28.84 m long. what is its period on earth?

This is the period of a pendulum.  Notice the mass doesn't matter.  Plugging in your values and 9.81m/s^2 for g, gives
T=10.7731s.

Question was not very clear if there are specific answer choices tell me and i'll try to you more. hope this though2 laps is 1 min. we know that for each min she does two times the amount of laps. for 12 laps we can do 12/2 which does give us 12 laps in 6 mins not 16 mins.