The Displacement from Equilibrium of an Oscillating Weight Suspended by a Spring

Multiple Choice

The displacement from equilibrium of an oscillating weight suspended by a spring is given by $y ( t ) = 4 \cos ( 8 t )$ , where y is the displacement in centimeters and t is the time in seconds.Find the displacement when $t = 1.25$ , rounding your answer to four decimal places.

A) 2.2693 cm
B) -3.3563 cm
C) -0.7275 cm
D) -6.5364 cm
E) 10.0903 cm