The ratio of shear stress to shear strain is ...

Modulus of elasticity of a material is the ratio of stress and strain. One end of a rope of length 4.5 m and diameter 6 mm is fixed to the branch of a tree.A monkey weighing 100 N jumps to catch the free end and stays there.Find the elongation of the rope.(Young's modulus= 4.8×10^11 N/m^2 ).

If longitudinal strain for a wire is 0*03 and its poisson's ratio is 0*5 , then its lateral strain is