A 61.0 kg skier is at the top of a slope, as shown in the figure. At the initial

Question

A 61.0 kg skier is at the top of a slope, as shown in the figure. At the initial point , she is 8.0 m vertically above point .

(a) Setting the zero level for gravitational potential energy at (b), find the gravitational potential energy of this system when the skier is at (a) and then at (b) . Finally, find the change in potential energy of the skier-Earth system as the skier goes from point to point .

PEi = J

PEf = J

?PE = J

(b) Repeat this problem with the zero-level at point .

PEi = J

PEf = J

?PE = J

(c) Repeat again, with the zero level 2.00 m higher than point .

PEi = J

PEf = J

?PE = J

Explanation / Answer

1. Pi=mgh=61*9.8*0=0j Pf=mgh=61*9.8*-8=-4782.4J 2. Pi=mgh=61*9.8*0=4782.4J Pf=mgh=61*9.8*-8=0J

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