A lamp hangs in equilibrium from a fixed support, held by three long identical wires. The lamp’s weight makes each wire extend by $0.40\,\text{cm}$. The height $h$ of the lamp above the floor is then measured. The centre wire suddenly snaps, and the lamp drops a short distance while the extensions of the other two wires increase. The wires obey Hooke’s law. When the lamp is again in equilibrium, the height $h$ of the lamp above the floor is measured once more. What is the difference between the two values of $h$?
- A$0.20\,\text{cm}$
- B$0.27\,\text{cm}$
- C$0.40\,\text{cm}$
- D$0.60\,\text{cm}$