A spring of negligible mass is attached to the ceiling of an elevator. When the elevator is slopped at the first floor, a mass M is attached to the spring, stretching the spring a distance D until the mass is in equilibrium. As the elevator starts upward toward the second floor, the spring stretches an additional distance D/4. What is the magnitude of the acceleration of the elevator? Assume the force provided by the spring is linearly proportional to the distance stretched by the spring.
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