Answer
Please see the work below.
Work Step by Step
We know that
(a) $U_{33}=mg\Delta y$
We plug in the known values to obtain:
$U_{33}=62KJ$
(b) $U_{59}=mg\Delta y$
We plug in the known values to obtain:
$U_{59}=(55)(9.8)(3.5)=111KJ$
(c) $U_{street}=mg\Delta y$
We plug in the known values to obtain:
$U_{street}=(55)(9.8)(0.0)=0.0KJ$
