(a) Set the zero level for gravitationalpotential energy at B , and find the gra

Question

(a) Set the zero level for gravitationalpotential energy at B, and find the gravitationalpotential energy associated with the skier at Aand B. Then find the difference in potentialenergy between these two points. PEA = 1 J PEB = 2 J difference in PE = 3 J
(b) Repeat this problem with the zero level at A. PEA = 4 J PEB = 5 J difference in PE = 6 J
(c) Repeat this problem with the zero level midway down the slope,at a height of 4.65 m. PEA = 7 J PEB = 8 J difference in PE = 9 J PEA = 1 J PEB = 2 J difference in PE = 3 J

Explanation / Answer

PEA = mgh = 55*9.8*9.3 = 5012.7J PEB = mgh = 0J difference = 5012.7 -0 = 5012.7J (b) PEA = 0J       PEB = 5012.7J difference PE = PEA - PEB (c) PEB = mgh = 55*9.8* ( 9.3 -4.65 ) =2506      PEA = mgh = 55*9.8*9.3 =5012.7J     difference = 5012.7 - 2506 = 2506 J (c) PEB = mgh = 55*9.8* ( 9.3 -4.65 ) =2506      PEA = mgh = 55*9.8*9.3 =5012.7J     difference = 5012.7 - 2506 = 2506 J

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