This is more of a concept problem that I'm trying to grasp. Verbatim from the book: "A box is moving with a horizontal velocity, v, relative to an inertial frame of reference so that a medallion of mass, m, inside of the box hangs from the roof of the box with an angle, theta, relative to the vertical as shown in Figure F. FIGURE F What can be said about the velocity of the box? What can be said about its acceleration? Explain." I'm thinking, the velocity is constantly changing and the acceleration is constant because there would have to be an acceleration to keep that medallion at the position. What do you guys think?