A person wearing roller skates is standing in front of a wall. Assume that the wheels on the skates are good enough that they roll ideally. The person pushes off the wall and begins traveling away from the wall. Call the initial state when the person was standing at rest in front of the wall with her hand touching the wall. The final state is when she has traveled 3 m away from the wall and is moving at a constant speed of 0.66 m/s. For which of the following systems does the energy remain constant? Click for a hint V A. System: girl V B. System: girl+wall VC. System: wall O D. None of the above. A person is jumping on a trampoline. After coming off of the trampoline, the person is in the air for 1.2 seconds. Call the initial state when the trampoline is at its lowest point with the person still on the trampoline. The final state is 1.02 seconds after the person comes off the trampoline. For which of the following systems does the energy remain constant? O A. System: person V B. System: trampoline O C. System: person + Earth O D. System: person + trampoline O E. System: person + trampoline + Earth O F. None of the above.

A person wearing roller skates is standing in front of a wall. Assume that the wheels on the skates are good enough that they roll ideally. The person pushes off the wall and begins traveling away from the wall. Call the initial state when the person was standing at rest in front of the wall with her hand touching the wall. The final state is when she has traveled 3 m away from the wall and is moving at a constant speed of 0.66 m/s. For which of the following systems does the energy remain constant? Click for a hint V A. System: girl V B. System: girl+wall VC. System: wall O D. None of the above. A person is jumping on a trampoline. After coming off of the trampoline, the person is in the air for 1.2 seconds. Call the initial state when the trampoline is at its lowest point with the person still on the trampoline. The final state is 1.02 seconds after the person comes off the trampoline. For which of the following systems does the energy remain constant? O A. System: person V B. System: trampoline O C. System: person + Earth O D. System: person + trampoline O E. System: person + trampoline + Earth O F. None of the above.