Need help answering these 3 questions with full working and explanation

Question ! Astronauts on a distant planet set up a simple pendulum of length 1 -2 m on that planet . The pendulum executes simple harmonic motion and makes 100 vibrations in 280 seconds. What is the acceleration due to gravit on that planet ? Question 2 When an lyect ofmass "m, is hume on a vertical spring and set into simple harmonic motion, it oscillates at frequency of 12 #3. When another mass "my" is hung on the spring alon with " m . " , the frequency of oscillation is to 4 Hz . Find the radio M 2 the masses 2The marble / shown in figure rolls down the track and around a loop of radius R ). The marble has mass ( m) & radius (r). what minimum height h must the track have for the marble to make it around the loop without falling off ? There is no friction . marble Loop h R