The position of an air-track cart that is oscillating on a spring is given by x = (12.4 cm) cos[(6.35s-1)t]. At what value of t after t = 0 s is the cart first located at x = 8.47 cm?
A)
4.34 s
B)
0.108 s
C)
0.129 s
D)
7.39 s
E)
7.75 s
C
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