Translate the variable expression into a word phrase.

n/(5m)

a. the product of a number and the quotient of 5 and m
b. the product of 5 and m divided by n
c. the quotient of n and the product of 5 and m
d. the difference of n and the product of 5 and m

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).