Basics, what happens if you drop two different bodies from the same height and at the same time? - Fundamental, in what way could the influence of the acceleration of gravity be controlled or diminished? - Fundamental, what factors could influence the speed of the object during free fall?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.