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A spring has an unstretched length of 15 cm. The spring is attached to the wall and stretched with a force sensor.

When the spring's length is 25 cm, the force sensor reads 3.5 N. The spring is then mounted vertically to the ceiling with a 0.4 kg mass attached to it, and allowed to oscillate up and down.

What is the period of the spring's oscillations?

A

0.67 s

B

0.84 s

C

0.88 s

D

1.27 s

E

1.40 s

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