Linda is training for a half marathon. she ran 3 1/3 miles on Monday 3.25 miles on Tuesday, and 2 1/2 miles on Wednesday. How many miles did she run in those 3 days

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).