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A massless spring of natural length of 0...

A massless spring of natural length of 0.5 m and spring constant 50 N/m has one end fixed and the other end attached to a mass of 250 g. The spring mass system is on a smooth floor. The mass is pulled until the length of the spring is 0.6 m and then released from rest. The kinetic energy of the mass when the length of the spring is 0.5 m is

A

0.25 J

B

2.25 J

C

6.25 J

D

9 J

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