The steps of a flight of stairs are 21.0 cm high (vertically). Part A If a 66.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the first step of the flight of stairs relative to the same person standing at the bottom of the stairs? Express your answer to three significant figures and include the appropriate units. PE1 = 136 J Submit Previous Answers Correct Part B If a 66.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the second step of the flight of stairs relative to the same person standing at the bottom of the stairs? Express your answer to three significant figures and include the appropriate units. PE2 = 272 J Submit Previous Answers CorrectPart C If a 66.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the third step of the flight of stairs relative to the same person standing at the bottom of the stairs? Express your answer to three significant figures and include the appropriate units. PE3 = 407 J Submit Previous Answers Correct Part D If a 66.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the n' step of the flight of stairs relative to same the person standing at the bottom of the stairs? O PEn = 136 J O PE. = n136 J O PE. = 136 . n J O PEn = 136" J O PEn = 136 J Submit Previous Answers V Correct Part E What is the change in energy as the person descends from step 7 to step 3? Express your answer to three significant figures and include the appropriate units. ? AE = 543.3 Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining