Suppose a mass-spring system has spring constant 769 N/m and mass 5.7 kg. The mass is displaced in the negative x-direction by 0.56 m and set in motion at 2.87 m/s in the positive x-direction. Calculate the phase shift as a positive angle in radians, assuming a cosine solution. red 0.41 swer 3.5571 margin of error +/- 1% Suppose a horizontal block-spring system has a spring constant 724 N/m and block of mass 8 kg. Calculate the angular frequency in rad/s. red 10.9 swer 9.5131 margin of error +/- 1%