# AP (Advanced Placement) Physics(B-C): Questions 226 - 228 of 921

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## Question number: 226

### Question

A box of mass *m* is being pushed a distance across a level surface at constant speed. In which of the following cases would the most work be done by a force on the box?

### Choices

Choice (5) | Response | |
---|---|---|

a. | The force is at a angle to the floor. | |

b. | The force is at a angle to the floor. | |

c. | The force is at a angle to the floor. | |

d. | The force is horizontal and parallel to the floor. | |

e. | Question does not provide sufficient data or is vague |

## Question number: 227

### Question

The gravitational potential energy of a system of two particles is equal to . In a second system, the mass of each particle is twice as great and the distance between their centers is half as great. What is the gravitational potential energy of the second system in terms of ?

### Choices

Choice (5) | Response | |
---|---|---|

a. |
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b. |
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c. |
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d. |
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e. | None of the above |

## Question number: 228

### Question

A ball is dropped onto the floor from height and bounces with velocity after it hits the floor. The coefficient of restitution between the ball and the floor is (the ratio of the ball’s velocity after it returns from the floor to its velocity before it hits the floor). If the ball is dropped from height , then what is its velocity after it hits the floor the second time, assuming the coefficient of restitution is the same?

### Choices

Choice (5) | Response | |
---|---|---|

a. |
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b. |
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c. |
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d. |
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e. | None of the above |