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

question 77

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 kinetic energy of 50 J and Y has a kinetic energy of:

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