Practice: The brakes of your car can provide an acceleration of 4.6m/s^{2}. You’re speeding at 37.5 m/s and suddenly see a police car, so you slam the brakes. How long will it take for your car to slow down to the speed limit of 25 m/s?

Subjects

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Vectors, Scalars, & Displacement | 14 mins | 0 completed | Learn |

Average Velocity | 33 mins | 0 completed | Learn |

Intro to Acceleration | 8 mins | 0 completed | Learn |

Position-Time Graphs & Velocity | 26 mins | 0 completed | Learn |

Conceptual Problems with Position-Time Graphs | 22 mins | 0 completed | Learn |

Velocity-Time Graphs & Acceleration | 6 mins | 0 completed | Learn |

Calculating Displacement from Velocity-Time Graphs | 15 mins | 0 completed | Learn |

Conceptual Problems with Velocity-Time Graphs | 11 mins | 0 completed | Learn |

Calculating Change in Velocity from Acceleration-Time Graphs | 11 mins | 0 completed | Learn |

Graphing Position, Velocity, and Acceleration Graphs | 11 mins | 0 completed | Learn |

Kinematics Equations | 53 mins | 0 completed | Learn |

Vertical Motion and Free Fall | 20 mins | 0 completed | Learn |

Catch/Overtake Problems | 23 mins | 0 completed | Learn |

Additional Practice |
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Motion Diagrams |

Proportional Reasoning |

Practice: The brakes of your car can provide an acceleration of 4.6m/s^{2}. You’re speeding at 37.5 m/s and suddenly see a police car, so you slam the brakes. How long will it take for your car to slow down to the speed limit of 25 m/s?

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A tennis ball with a speed of 10 m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 7.69 m/s. If the ball is in contact with the wall for 0.0122 s, what is the average acceleration of the ball while it is in contact with the wall? Take “toward the wall” to be the positive direction.

A 50.0-g Super Ball traveling at 25.0 m/s bounces off a brick wall and rebounds at 22.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms what is the magnitude of the average acceleration of the ball during this time interval?

A sprinter accelerates from rest to 9.00 m/s in 1.28 s. What is her acceleration in:(a) m/s2?(b) km/h2?

2. If an object moves with constant acceleration, its velocity mustA) be constant also. B) always decrease. C) change by the same amount each second. D) Change by varying amount depending on its speed.

8. An object covers a distance of 8 meters in the first second of travel another 8 meters during the next second, and 8 meters again during the third second. Its acceleration in meters per second per second is approximately A) 8. B) 24.C) 5. D) 0.

Which has zero acceleration? An object A) moving at constant velocity. B) at rest. C) in mechanical equilibrium. D) all of the above E) none of the above

A boxer's fist and glove has a mass of m = 0.92 kg. The boxer's fist can obtain a speed of v = 0.25 m/s in a time of t = 0.23 sFind the magnitude of the average acceleration aave in meters per square second of the boxer's fist.

(a) A light-rail commuter train accelerates at a rate of 1.35 m/s2. How long does it take to reach its top speed of 80.0 km/h, starting from rest? (b) The same train ordinarily decelerates at a rate of 1.65 m/s2. How long does it take to come to a stop from its top speed? (c) In emergencies the train can decelerate more rapidly, coming to rest from 80.0 km/h in 8.30 s. What is its emergency deceleration in m/s2?

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