A block tied between two springs is in equilibrium. If upper spring is cut then the acceleration of the block just after cut is $6 m / s^{2}$ downwards. Now, if instead of upper spring, lower spring is being cut then the acceleration of the block just after the cut will be:

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Take g = 10 m/ s 2 . Let the lower spring push the block up with force F l ​ and the upper spring pull it up with force F u ​ . Equilibrium: F u ​ + F l ​ = m g . Upper spring cut: m g − F l ​ = 6 m ⇒ F l ​ = 4 m , so F u ​ = 6 m . Lower spring cut: a = m m g − F u ​ ​ = m 10 m − 6 m ​ = 4 m/ s 2 downwards.

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