$*$Please thoroughly explain how sections are created and how equations are derivied. Thank you.

For the beam and loading shown, knowing that $P=30kN,L=1\mathrm{.}2m,$ and $E=200$GPa,

determine the deflection at point $A.$ The beam is a W $20046\mathrm{.}1$ rolled steel shape. Hint:

First you need to develop the general solution from the governing differential equation.

$y_A=2\mathrm{.}48mm$