In physics, a question about what forces are zero in a pre-lecture on Rotational

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wondering

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Kinetic Energy and Inertia? Which of the above terms are zero? (Define the zero of potential energy as the ground.) HINT: it is more than one... i cant get it, also the 2's are all supposed to be squared at the end of each term

1/2 m vi2
1/2 I wi2
m g yi
1/2 m vf2
1/2 I wf2
m g yf
 
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