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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.

C | I | Question | Answer |
---|---|---|---|

2 | A truck moves 70 m east, then moves 120 m west, and finally moves east again a distance of 90 m. If east is chosen as the positive direction, what is the truck's resultant displacement? | 40 m | |

2 | A v vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 s the acceleration of the ball is zero. We know that at t = 5 s | the velocity of the ball is not changing. | |

2 | A vehicle designed to operate on a drag strip accelerates from zero to 30 m/s while undergoing a straight line path displacement of 45 m. What is the vehicle's acceleration if its value may be assumed to be constant? | 10 m/s2 | |

2 | A water rocket, launched from the ground, rises vertically with acceleration of 30 m/s^2 for 1.0 s when it runs out of "fuel." Disregarding air resistance, how high will the rocket rise? | 61 m | |

2 | An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 10.0 s. What distance does the car travel? | 150 m | |

2 | An object is dropped from a height. Once it is moving, which of the following statements is true, at least at one point? | Its velocity is never equal to its acceleration. | |

2 | An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the average speed of the object? | 0.50 m/s | |

2 | An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object? | 0 (no sign) | |

2 | An x vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 s the velocity of the ball is zero. We can be positive that at t = 5 s, | the ball has stopped. | |

2 | At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 15.0 m/s. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff? | 1.78 s | |

2 | Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities? | speed | |

2 | Displacement is which of the following types of quantities? | vector | |

2 | Gwen releases a rock at rest from the top of a 40-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground? | 28 m/s | |

2 | Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is: | 20 cm. | |

2 | If the displacement of an object is given in SI units by Dx = -3t + 4t^2, at t = 2 s its velocity and acceleration are, respectively: | positive, positive. |

Time lapse: 0.0169 s.

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