Physics 163

Unit 5: Work, Energy and Power

Problem Set B

 

Problem 13:

Esteemed Chinese ski jumper, Li Ping Phar, leaves the jump ramp with a kinetic energy of 16046 Joules and a potential energy (relative to the bottom of the ski hill) of 12836 Joules. She encounters -2052 Joules of work due to air resistance during her flight through the air. Determine the speed (in m/s) of her 49.2-kg body the instant prior to striking the ground at the bottom of the hill.  

 

 

 

 

 

Use the equation below to solve this problem. Cancel terms, substitute and solve.

 KEi + PEi + Wnc = KEf + PEf

 

Work and energy principles and mathematical relationships can be reviewed on the Set B Overview page.

Further information about the work and energy relationship is available online at The Physics Classroom.    

 

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