Work, Energy, Power, and Energy Conservation. When TWICE went to Switzerland, Sana crossed the bridge in Jungfraujoch. One of its peak walks (Gstaad Glacier 3000 area) has a height of 9800 ft above sea level.

 (a) What is Dahyun and Sana’s (mass of 48kg and 49 kg respectively) gravitational potential energy at that peak walk? 

(b) Let us imagine that they plan to ski down the glaciers in ski school and huskies which have a height from point A[use the previous height as an approximation] to B [9722 ft above sea level] and a vertical distance of 39.37 ft. Find Sana’s final speed as she attempts to ski to point B [hint: you must find the diagonal distance and use the work-energy theorem – relation of potential and kinetic energy]. 

(c) Find the total work done made by Sana during the skiing [hint: use any method that you are confident with].