Suppose you draw cards at random from the following collection. You choose one card and replace it (put it back.) Find the following probabilities as fractions in simplest form. S P R I N G B R E A K
part A:
P(R then R)

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).