A sliding collar of m=80 kg falls onto a flange at the bottom of a vertical rod (Fig. P4...

A sliding collar of m=80 kg falls onto a flange at the bottom of a vertical rod (Fig. P4.44). Calculate the height h through which the mass m should drop to produce a maximum stress in the rod of 350 MPa. The rod has length L=2m, cross-sectional area A=250 mm² and modulus of elasticity E=105 GPa.