1. The problem statement, all variables and given/known data A girl in an elevator is holding one end of a string, and a weight hangs from the other end. In which of the following cases is the magnitude of the tension in the string greatest? (a) while the elevator moving downward and it is slowing down (b) while the elevator moves upward at constant speed (c) while the elevator is moving upward at it is slowing down (d) while the elevator moves downward with constant speed (e) while the elevator is at rest 2. Relevant equations F=ma F=mg 3. The attempt at a solution This is an online homework problem. I thought the answer was simple, but I actually got it wrong. I'm trying to figure out why, and here's what I thought as I solved the problem. When the elevator is at constant speed, that means that there is no acceleration, and gravity is the only resulting force that pushes the weight down. This is the same for when the elevator is at rest. Therefore, choices B, D, and E are all of equal value. In choice A, the elevator is moving downward, and slowing down. That means the hanging weight is being exposed to a changing velocity, or acceleration, in the downward direction. The acceleration causes the weight to become heavier as it slows down. In choice C, the elevator is moving upward and slowing down. The acceleration is already causing the weight to be heavy, and it is becoming lighter. The way I thought of it was that choices B, D, and E are all incorrect because they have the same values. Choice A means that the tension has some value but has not reached its heaviest yet, whereas choice C means that the tension is decreasing FROM a heavier weight. I thought choice C was the correct answer.