[M.D. Holloway]

Conditions:

A backhoe weighing 22 tons is on top of a lowboy trailer and heading
east on Interstate 70 near Hays, Kansas .

The extended shovel arm is made of hardened refined steel and the
approaching overpass is made of commercial-grade concrete, reinforced
with 1 inch steel rebar spaced at 6 inch intervals in a criss-cross
pattern layered at 1 foot vertical spacing.

Solve:

When the shovel arm hits the overpass, how fast do you have to be
going to slice the bridge in half ? (Assume no effect for headwind
and no braking by the driver.)


Extra Credit: Solve for the time and distance Required for the entire
rig to come to a complete stop after hitting the overpass at the
speed calculated above. Yes, you can neglect friction