4. The Pacer Test. As a warm-up, Gene is trying to do everyone's favorite Pacer test, which involves running back and forth between two markers 20 m apart in a sufficient amount of time. When Gene runs, he starts from rest, accelerates at a constant rate, decelerates at a constant rate, and finishes at rest in order to make the next lap as soon as possible. The Pacer test starts slow, but picks up speed for each lap. Gene is on one of the last laps and is starting to lose breath already. If Gene can accelerate at 0.3m/s? and decelerate at 1.2 m/s, how long is the fastest 20m lap he could possibly run?

4. The Pacer Test. As a warm-up, Gene is trying to do everyone's favorite Pacer test, which involves running back and forth between two markers 20 m apart in a sufficient amount of time. When Gene runs, he starts from rest, accelerates at a constant rate, decelerates at a constant rate, and finishes at rest in order to make the next lap as soon as possible. The Pacer test starts slow, but picks up speed for each lap. Gene is on one of the last laps and is starting to lose breath already. If Gene can accelerate at 0.3m/s? and decelerate at 1.2 m/s, how long is the fastest 20m lap he could possibly run?

Name: 4. The Pacer Test.As a warm-up, Gene is trying to do everyone's favor
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Description: 4. The Pacer Test.As a warm-up, Gene is trying to do everyone's favorite Pacer test, whichinvolves running back and forth between two markers 20 m apart in a sufficient amount of time. When Generuns, he starts from rest, accelerates at a constant ra

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter2: Motion In One Dimension

Section: Chapter Questions

Problem 39AP: Hannah tests her new sports car by racing with Sam, an experienced racer. Both start from rest, but...

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The Pacer Test. As a warm-up, Gene is trying to do everyone’s favorite Pacer Test, which involves running back and forth between two markers 20 m apart in a sufficient amount of time. When Gene runs, he starts from rest, accelerates at a constant rate, decelerates at a constant rate, and finishes at rest in order to make the next lap as soon as possible. The Pacer test starts slow, but picks up speed for each lap. Gene is on one of the last laps and is starting to lose breath already. If Gene can accelerate at 0.3 m/s2 and decelerate at 1.2 m/s2, how long is the fastest 20 m lap he could possibly run?
4. A Porsche challenges a Honda to a 400 m race. Because the Porsche's acceleration of 3.5 m/s² is larger than the Honda's 3.0 m/s², the Honda gets a 1.0 s head start. Who wins? By how many seconds?
1. You are driving your 2015 Volkswagen Golf at night on a straight road through the woods at 60 mph. Suddenly, a deer appears in your headlights 32 meters away. You immediately apply the brakes which causes your car to slow down at a constant rate, coming to rest just before making contact with the deer. 1 mile = 1.61 km a. How long in seconds did it take for your car to come to a complete stop? b. If you were initially driving in the 'positive x' direction, then what was your acceleration during the braking maneuver, in vector form and in m/s2?
7. A car and a jeep are 7 km apart. The car starts from rest and travels towards the jeep with an acceleration of 3.5m/,2. The jeep starts from rest and travels towards the car with an acceleration of 2.25 m/2. Where and where they will meet if: a. They started at the same time? b. The jeep started 5 seconds ahead of the car?
As a warm-up, Gene is trying to do everyone’s favorite Pacer Test, which involvesrunning back and forth between two markers 20 m apart in a sufficient amount of time. When Gene runs, hestarts from rest, accelerates at a constant rate, decelerates at a constant rate, and finishes at rest in order tomake the next lap as soon as possible. The Pacer test starts slow, but picks up speed for each lap. Gene is onone of the last laps and is starting to lose breath already. If Gene can accelerate at 0.3 m/s^2 and decelerate at 1.2 m/s^2, how long is the fastest 20 m lap he could possibly run?
2. Two cars are drag racing. The red car accelerates at a rate of 4.7 m/s', and the blue car at a rate of 3.9 m/s’. The blue car starts 1.5 s before the red. Find the time it takes for the red car to be at the same position as the blue car, how the cars have traveled, and how fast each is moving at this time.
1. A car has an initial speed of 25 m/s and a constant deceleration of 3 m/s. Determine the velocity of the car when t = 4 S. What is the displacement of the car during the 4-s time interval? How much time is needed to stop the car?
2. A car traveling at 20 m/s when the driver sees a child standing on the road. He takes 0.80s to react, then steps on the brake and slows at 7.0 m/s². How far does the car go before it stop?
3 a. A motorcyclist travelling with a constant speed of 15m/s passes a school crossing corner, where the speed limit is 10m/s. Just as the motorist passes the school crossing sign, a police officer on a motorcycle stopped there, starts in pursuit with a constant acceleration of 3.0m/s?. I. How much time elapses before the officer meets the motorist? II. What is the Police officer's speed at that time? III. At that time, what distance have each vehicle travelled?
2. You are driving down a street in a car at 50 km/h. Suddenly, a child runs into the street. It takes you 0.5 s to react and apply the brakes. How many meters will you have traveled before you begin to slow down? 3. A racer decelerates at 10 m/s². If his car is going at 50 m/s, how many meters will it take for him to stop?
4. A turtle is moving with a constant acceleration along a straight ditch. He starts his stopwatch as he passes a fence post and notes that it takes him 10 s to reach a pine tree 10 m farther along the ditch. As he passes the pine tree, his speed is 1.2 m/s. How far was he from the fence post when he started from rest?
1. What is the acceleration of a car if it starts from rest and accelerates uniformly over a time of 2.2 seconds for a distance of 30m ? 2. A bike accelerate uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine the acceleration of the bike.