Physics 163

Unit 5: Work, Energy and Power

Problem Set A

Problem 3:

A 5.17-kg object is tied to a rope and lifted vertically upward at a constant speed of 1.7 m/s for a displacement of 23.9 m. Determine the work (in Joules) done upon the object.

• Read the problem carefully and diagram the physical situation
• Identify known and unknown information in an organized manner
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Work, energy and power concepts can be reviewed on the Set A Overview page.

Further information about the concept of and equation for work is available online at The Physics Classroom.

Further information about the mass-weight relationship is available online at The Physics Classroom.

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