Problem 3. Allison is at the top of the cliff of height H. Her friend Anthony is a distance R from the base of the cliff. Allison drops a rock

of mass m from rest right at the cliff's edge. (a)Determine the angular momentum of the rock as measured by Allison (who is certainly at the origin of her own xyz coordinate system). While they are slightly shifted horizontally in the diagram, you may assume that the rock m noves completely along the -y axis as viewed by Allison. (b) Determine the angular momentum of the rock as measured by Anthony (who is certainly at the origin of his own xyz coordinate system). (c) What is the angular momentum measured by Anthony the instant before the rock hits the ground? (d) Did the angular momentum measured by Allison change with time? Did the angular momentum measured by Anthony change with time? Explain why the answers to these questions are different (and your answer cannot just be a mathematical one).