Question

A 21 kg child swings on a playground swings 3.6 m long. What is period of her motion?
2) If her older brother, who weighs twice as much as she does, rides in the swing instead, what is the period of the motion? Assume the center of mass to be at the position of the seat in both cases.....please I need help me

Answer 1

For heaven's sake Google simple pendulum period. You will notice that it has noting to do with the mass but only the length and the local acceleration of gravity. It is proportional to the square root of L/g