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You hang a mass on a spring and pull it down 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 decrease the period of the oscillation?

Select TWO answers.

A

Compress the spring rather than pulling it down.

B

Decrease the amount of mass on the spring.

C

Pull the mass down with a smaller initial amplitude.

D

Hang a second spring in parallel with the one that was there originally.

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