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6) A simple pendulum consists of a 1.0-kg brass bob on a string It has a period of 2.0 seconds. The pendulum would have a period of 1.0 second if the A. string were replaced by one about 0.25 m long B. string were replaced by one about 2.0 m long C bob were replaced by a 0.25kg brass sphere D bob were replaced by a 4.0kg brass sphere E. amplitude of the motion were decreased