Question

A vertical wire is suspended from one end A weight of 20N is attached to the other end to stretch the wire.if the weight extends the wire by 1mm, calculate the energy gained by the wire

Answer 1

Force acting, F = mg = 20N

Displacement in the spring, x = 1mm = $10^{-3} m$

Potential energy gained by wire, $P.E. = mgh=20*10^{-3} = 0.02 J$