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You hang a mass on a spring and pull it down slightly to start the system oscillating. Next, you measure the period of the resulting motion of the mass on the spring.

Which of the following changes would exactly double the period of the oscillation?

Select TWO answers.

A

Add a second identical spring in parallel with the one you have.

B

Pull the mass down with an initial amplitude which is twice as much as the original when you measured the period.

C

Arrange a total of four springs exactly like the first one in series.

D

Add three more identical units of mass to the spring.

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