1. You have two playing cards with a sum of (−12) in your hand. a. What two cards could you have?
b. You add two more cards to your hand, but the total sum of the cards remains the same, (−12). Give two different examples of two cards you could choose.

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).