a ball is connected by a string to a vertical post. the ball is set in horizontal motion so that it starts winding the string around the post. assume that the motion is confined to a horizontal plane, i.e., ignore gravity. michelle and astrid are trying to predict the final velocity of the ball when it reaches the post. michelle says that according to conservation of angular momentum, the ball has to speed up as it approaches the post. astrid says that according to conservation of energy, the ball has to keep a constant speed. who is right? [hint: how is this different from the case where you whirl a rock in a circle on a string and gradually reel in the string?|