A block of mass m is initially moving to the right on a horizontal frictionless surface at a speed v. It then compresses a spring of spring constant k. At the instant when the kinetic energy of the block is equal to the potential energy of the spring, the spring is compressed a distance of:
A) 
B) (1/2) mv2
C) (1/4) mv2
D) mv2/4k
E) 
Correct Answer:
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