However, if the cart was moving relative to Earth, and we were moving along with the cart, the motion of the ball and the cart would look exactly the same! The motion of the orange ball as seen in Ear...However, if the cart was moving relative to Earth, and we were moving along with the cart, the motion of the ball and the cart would look exactly the same! The motion of the orange ball as seen in Earth's reference frame is depicted in the animation by the time, position, and velocity measurements, t,x1, and v1, respectively (position is given in meters and time is given in seconds).