n = number of cycles = 71
t = duration = 121 s
f = frequency = n/t = 71/121 = 0.587 hz
w = angular frequency = 2f = 2 (3.14) (0.587) = 3.7 rad/s
A = amplitude = 0.913 m
Vmax = Aw = 0.913 x 3.7 = 3.4 m/s
m = 2.47 kg
w = sqrt(k/m)
3.7 = sqrt(k/2.47)
k = 33.81 N/m
Umax = (0.5) k A2 = (0.5) (33.81) (0.913)2 = 14.1 J
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