A calibration trolley of mass $M$ on a frictionless track is attached to a spring of stiffness $k$. The trolley is displaced by a distance $X$ from its equilibrium position and released from rest, oscillating with simple harmonic motion. The maximum kinetic energy of the trolley during this oscillation is $E_k$.

The setup is then altered:

• The trolley's mass is increased to $3M$.
• The spring is replaced with one of stiffness $2k$.
• The trolley is displaced by a distance $2X$ from its equilibrium position and released from rest.

What is the maximum kinetic energy of the trolley in this new oscillation?