Draw the influence line for the vertical reaction at $A$ ($R_A$) for a simply supported beam of length $L = 10 \text{ m}$, supported at $A$ ($x=0$) and $B$ ($x=10$).

Draw the influence line for internal shear at point $C$, located at midspan ($x = 5 \text{ m}$) of the same $10 \text{ m}$ simply supported beam.

Draw the influence line for internal bending moment at point $C$ (midspan, $x=5 \text{ m}$) for the $10 \text{ m}$ simply supported beam.

A simply supported beam spans $10 \text{ m}$. A series of two wheel loads from a truck ($P_1 = 40 \text{ kN}$, $P_2 = 80 \text{ kN}$, spaced $3 \text{ m}$ apart) moves across the beam. Find the maximum bending moment at midspan ($C$).

For the same $10 \text{ m}$ beam and moving truck ($P_1 = 40 \text{ kN}$, $P_2 = 80 \text{ kN}$, spacing $3 \text{ m}$), calculate the absolute maximum bending moment that can occur anywhere in the beam.

Find the absolute maximum shear in the $10 \text{ m}$ beam for the same moving truck.