A mass is vibrating at the end of force constant 225 N/m. The figure shows a graph of its position x as a function of time t.
a) At what times between t = 0 s and t = 4.5 s including the endpoints of the interval, is the mass not moving?
b) How much energy did this system originally contain?
c) How much energy did the system lose between t = 1.00 and t = 4.00?
d) Where did this energy go?