A block along a frictionless tabletop…. WILL RATE LIFESAVER!

A 2.2 kg block slides along a frictionless tabletop at 5.0 m/s toward a second block (at rest) of mass 4.2 kg. A coil spring, which obeys Hooke's law and has spring constant k = 890 N/m, is attached to the second block insuch a way that it will be compressed when struck by the moving block, see the figure.

6 J


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