Select the correct answer. in the image, two circles are centered at a. the circle containing b was dilated to produce the circle containing b′. what is the scale factor of the dilation? a. 1 b. 2 c. 0.5 d. -0.5

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).