Question: Write down the potential energy for the following mass-spring chains with identical unit springs when subject to a uniform gravitational force: (a) Three identical masses

Write down the potential energy for the following mass-spring chains with identical unit springs when subject to a uniform gravitational force:
(a) Three identical masses connected to only a top support.
(b) Four identical masses connected to top and bottom supports.
(c) Four identical masses connected only to a top support.

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