Physics 163

Unit 5: Work, Energy and Power

Problem Set B

Problem 12:

A 320.9 gram ball is moving along the ground with a speed of 2.1 m/s. It approaches a hill inclined at 16 degrees to the horizontal. What potential energy (in Joules) will the ball have when it reaches the peak of its path up the incline? (Ignore any effects of rotation or friction.) Enter your answer accurate to the third decimal place.

• 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

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.