We have common experience that a thin thread breaks if pulled at its ends. Also a thin metalic wire, when pulled at the ends elongates and then contracts, when released. A lift is tied with thick iron wires and its mass is `1000kg`. What should be the minimum diameter of the wire if the maximum acceleration of the lift is `1.2m/s^2` and maximum safe stress of the wire is `1.4xx10^8N/m^2` (g=`9.8m/s^2`)