Physics 163

Unit 5: Work, Energy and Power

Problem Set B

Problem 10:

A 631-kg roller coaster car is lifted to a height of 47 meters above the ground where it begins its descent from an initial rest position. If -10523 Joules of work are done on the car as it descends the first hill to ground level, then what is its kinetic energy (in Joules) at the bottom.

• Read the problem carefully and diagram the physical situation (trajectory diagram)
• Identify known and unknown information in an organized manner (x-y table)
• 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

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.

Return to: Set B Overview Page || Audio Help Home Page || Set B Sample Problems

Audio Help for Problem: 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 || 10 || 11 || 12 || 13 || 14

Retrieve info about: Audio Help || Technical Requirements || Usage Policy || CD-ROM