Unit 5: Work, Energy and Power
Problem Set C
Esteemed Chinese ski jumper, Li Ping Phar, leaves the jump ramp with an initial speed of 33.1 m/s and a height (relative to the bottom of the ski hill) of 56.2 meters. She encounters -7624 Joules of work due to air resistance during her flight through the air. Determine the speed (in m/s) of her 45.2-kg body the instant prior to striking the ground at the bottom of the hill.
0.5 m vi2 + m g h i + F d cos = 0.5 m vf2 + m g h f
General information about work and energy problems is described on the Set C Overview page.
A detailed discussion of how to analyze physical situations using work-energy bar charts is provided online at The Physics Classroom.
A detailed description of the work-energy relationships for situation in which external forces are doing work is provided online at The Physics Classroom.
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