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RE: SmartStudy Physics Quest 002
B, C and D.
Mass will not affect the swing for it offsets itself with gravity. The heavier an object is, the more sluggish it would make the oscillation. Yet the more it is pulled by gravity, the faster it makes the oscillation. The speed decrease and increase perfectly offset each other.
Use the simulation to check your answer https://phet.colorado.edu/sims/html/pendulum-lab/latest/pendulum-lab_en.html