The gravitational force formula is where is the force between two objects, G is the constant
of gravitation, mi is the mass of the first object, m2 is the mass of the second object, and r is the distance
Gmm
7=
between the objects. By rewriting the formula as
F
you can find the distance between objects.
Which of the following gives the distance, r, in simplest form?

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).