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 -2.0 m.   mechanical energy of the mass-spring system                                                                                              spring potential energy of the spring                                                                                              kinetic energy of the block A. -40 J B. 60 J C. 50 J D. 20 J E. -50 J F. 90 J G. 40 J

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