The A-36 steel bolt is required to absorb the energy of a 3-kg mass that falls \( h=25 \mathrm{~mm} . E=200 \mathrm{GPa} \).
Part A
If the bolt has a diameter of 6 mm , determine its required length \( L \) so the stress in the bolt does not exceed 170 MPa . Express your answer to three significant figures and include appropriate units.
\[
L=
\]