Two cars start at the same point in trouble in opposite directions. the first car travels 10 mph faster than the second car. in three hours, the cars are 270 miles apart. what is the rate of the second car? 40mph 50mph 80mph 90mph

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).