1. The problem statement, all variables and given/known data A particle of mass M is hanging from one end of a massless spring, while the other is attached to the ceiling of an elevator. The elevator then starts to move upwards at an acceleration equal to g/5. Which way does the equilibrium shift, and what is the magnitude of the shift? 2. Relevant equations F=-kx, F=ma 3. The attempt at a solution Equilibrium when not moving... F=-kx=mg, so x=-(mg/k) When moving... F=-kx=m(g+(g/5)) x= -(mg/k) - (mg/5k) Where the magnitude of the shift is -(mg/5k), and the equilibrium would shift downwards. Is this correct? Im a bit confused because i though x was displacement from equilibrium.