Two Identical Balls Are at Rest and Side by Side

question 54

Multiple Choice

Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:

• A) it has the same position and the same velocity as A.
• B) it has the same position and the same acceleration as A.
• C) it has the same velocity and the same acceleration as A.
• D) it has the same displacement and the same velocity as A.
• E) it has the same position, displacement and velocity as A.

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Definitions:

Mental Categories

The classifications of cognitive information into organized groups in the brain, facilitating understanding and memory.

Simultaneously

Occurring, existing, or done at the same time as something else, indicating a concurrent action or event.

Number System

A mathematical system for representing and working with numbers, such as the decimal or binary systems.

Robert Siegler

A developmental psychologist known for his research on children's thinking and adaptive strategy choice model explaining how children learn and solve problems.