Physics 163

Unit 5: Work, Energy and Power

Problem Set B

 

Problem 9:

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 speed (in m/s) 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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