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A 4.0 kg-block attached to a 20 N/m-spring constant spring moves on a frictionless horizontal surface, back and forth between -3.0 m and +3.0 m. Match the answers with questions when the block is at 1.0 m. mass spring system - mechanical energy of the mass-spring system - spring potential energy of the spring - kinetic energy of the block
A. -10 J
B. 20 J
C. -80 J
D. 80 J
E. 10 J
F. 60 J
G. 90 J



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