x (cm) 5 t (s)
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A mass is vibrating at
the end of a spring of force constant
225 N/m. Figure
shows a graph of its position x as
a function of time t. (a) At what
times is the mass not moving?
(b) How much energy did this system
originally contain? (c) How
much energy did the system lose
between t = 1.0 s and t = 4.0 s?
Where did this energy go?
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