A rod AD consisting of three segments AB, BC and CD joined together is hanging vertically from a fixed support at A. The lengths of the segments are respectively : 1 m, 0.2 m and 0.15 m. The cross section of the rod is uniformly `10^(–4) m^(2)`. A weight of 10 kg is hung from D. Calculate the displacements of point of B, C and D using the data of Young's moduli given below (neglect the weight of the rod).
`Y_(AB) =2.5xx10^(10) N//m^(2)`,
`Y_(BC)=4.0xx10^(10) N//m^(2)`,
`Y_(CD) =1.0 xx10^(10) N//m^(2)`

Explanation

`4.90xx10^(-6) m`