Physics 163

Unit 5: Work, Energy and Power

Problem Set B

Problem 2:

A skier is moving along a plateau of a ski slope with a kinetic energy of 6209 Joules and a potential energy of 10418 Joules (relative to the bottom of the slope). If the skier has a kinetic energy of 22418 Joules at the bottom of the slope, then what quantity of work (in Joules) was done upon the skier by use of the poles? If the value is negative, then enter your answer as a negative number.

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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