Physics 163

Unit 5: Work, Energy and Power

Problem Set B

 

Problem 4:

A 160-gram baseball is moving with a kinetic energy of 39.7 Joules and a potential energy of 47.6 Joules at one location in its trajectory. If the effect of air resistance on the baseball can be ignored, then what is its kinetic energy (in Joules) the instant prior to striking the ground? 

 

 

 

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 energy conservation situations is available online at The Physics Classroom.      

 

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