In a Problem Using Energy Considerations to Solve for the Speed

question 69

Multiple Choice

In a problem using energy considerations to solve for the speed of a ball thrown from the top of a building when it strikes the ground below,where should the potential energy have its zero value?

• A)It should be at the level from where the ball is thrown.
• B)It should be at the ground level where the ball hits.
• C)It should be slightly below ground level so the potential energy is always positive.
• D)It doesn't matter since only differences in potential energy matter in solutions.

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