9. While traveling in your shiny new BMW Z4, you spot a police officer. You brake the car from 75 km/h to 45 km/h over a distance of 88 m. Va) What is the acceleration, assuming it is constant. b) What is the elapsed time of breaking? c) If you continue to slow the car down to a stop with the same constant acceleration as in part a, how long, in total, is required to bring the car to a stop from 75 km/h? d) In the case of part c, how far did the car travel while breaking? b) 5.29 s c) 138 m d) 13.2s Answers: a) –1.57 m/s 10. A rock is dropped from a cliff 100 m above a canyon floor. a) How long does it take the rock to drop the first 50 m? b) How long does it take the rock to drop the last 50 m?
9. While traveling in your shiny new BMW Z4, you spot a police officer. You brake the car from 75 km/h to 45 km/h over a distance of 88 m. Va) What is the acceleration, assuming it is constant. b) What is the elapsed time of breaking? c) If you continue to slow the car down to a stop with the same constant acceleration as in part a, how long, in total, is required to bring the car to a stop from 75 km/h? d) In the case of part c, how far did the car travel while breaking? b) 5.29 s c) 138 m d) 13.2s Answers: a) –1.57 m/s 10. A rock is dropped from a cliff 100 m above a canyon floor. a) How long does it take the rock to drop the first 50 m? b) How long does it take the rock to drop the last 50 m?
Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter2: Motion In One Dimension
Section: Chapter Questions
Problem 2.73AP: Kathy tests her new sports car by racing with Sian, an experienced racer. Both start from rest, but...
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Please solve 9c and 9d. Please solve 10 too
The acceleration was -1.57 m/s^2.
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