5. By Eq. 10-52, the work required to stop the hoop is the negative of the initial kinetic
energy of the hoop. The initial kinetic energy is
KI
m
v
=+
1
2
2
1
2
2
ω
(Eq. 11-5), where
I =
mR
2
is its rotational inertia about the center of mass,
m
= 140 kg, and
v
= 0.150 m/s is the

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