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a) Show (and explain) how you would find the potential energy of a small mass placed...

a) Show (and explain) how you would find the potential energy of a small mass placed a distance D away from the center of a disk of mass M and along radius A along its central axis.

b) Show how you would use this to find the final kinetic energy of the small mass m if it fell from rest at distance D to a distance D/2.

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