Two Objects, X and Y, Are Held at Rest on a Horizontal

question 53

Multiple Choice

Two objects, X and Y, are held at rest on a horizontal frictionless surface and a spring is compressed between them. The mass of X is 2/5 times the mass of Y. Immediately after the spring is released, X has a kinectic energy of 50 J and Y has a kinetic erengy of:

• A) 20 J
• B) 8 J
• C) 310 J
• D) 125 J
• E) 50 J

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