A massless spring with spring constant k is connected ... ...

    A massless spring with spring constant k is connected on one end to a wall and on the other end to a massless plate. A mass m is sitting on a frictionless floor. The mass m is slid against the plate and pushed back a distance x. After its release, it reaches a maximum speed v₁. In a second experiment, a larger mass 9m is pushed back the same distance x. After its release, it reaches a maximum speed v₂. How does the final kinetic energy E₁ of the first mass compare with the final kinetic energy E₂ of the second mass?
(A) E₁ = E₂/3
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 11. Periodic Motion and Waves

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