9.3

A block is attached to a ceiling by a spring of force constant y() (cm) k. When pulled down and released, the block undergoes simple harmonic motion. The motion of the block is shown in @ Macmillan Learning the time plot. Which of the choices most closely describes the Which of the equations of motion best describes the amplitude A and frequency f of the motion of the block? motion of the block? O A = 4cm; f = 37 Hz O y(1) - 2 cos() O A = 4 cm; f =- - Hz O y(1) = 4 cos 167 O y(1) - 2 cos(81) O A =2cm; f = 16x Hz O y(t) - 4 cos( 161) - O A = 2 cm; f = 16/ Hz If the mass of the block is 2.14 kg, what is the force constant & of the spring? k = N/m