Chapter 8, Problem 5MCP

Two masses, M and 5M, are at rest on a horizontal frictionless table with a compressed spring of negligible mass between them. When the spring is released (there may be more than one correct choice),

1. A.    the two masses receive equal magnitudes of momentum.
2. B.     the two masses receive equal amounts of kinetic energy from the spring.
3. C.     the heavier mass gains more kinetic energy than the lighter mass.
4. D.    the lighter mass gains more kinetic energy than the heavier mass.