[moderator's note: moved to homework forum so no template] In picture 3, [itex]A[/itex] has touched the ground, so it has stopped. But [itex]B[/itex] has a velocity upward. So in this situation, the cable is not straight. What will be the tension of the cable and what will be the accelertion of [itex]B[/itex] in picture 3 ? Please explain 'why' in details.