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A solid block is attached to an ideal spring with a relaxed length of 30.0 cm, as shown in the diagram above. To set the system into motion, the spring is stretched to a length of 35.0 cm and then released.

The system oscillates with simple harmonic motion as the block slides back and forth across the frictionless surface, reaching a maximum kinetic energy of 2.5 J.

Determine the spring constant of the spring.

A

$k= 4.1 x 10^{-3}\cfrac{N}{m}$

B

$k=50\cfrac{N}{m}$

C

$k=100\cfrac{N}{m}$

D

$k=2000\cfrac{N}{m}$

E

There is not enough information given.

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