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7. A race car accelerates from rest to 55 m s-1 in 5.0 seconds. The acceleration of the car Is m s-² 8. An object's speed increases uniformly from 10.5 km per hour to 99.8 km per hour in 2.41 seconds. Calculate the acceleration in m s-2 and express your answer to three significant figures. 9. The acceleration-time graph of a car is shown below. The initial speed of the car is 5.0 m s-1. # Acceleration (ms) 12 8.0- 4.0- 2.0 4.0 6.0 Time (s) Calculate the velocity of the car at t = 4.0 s. 3 ka 10. A police car, initially at rest at point X, moves with a constant acceleration of 6.2ms on a horizontal road as shown below. It passes through point Y 4.0 s later. Police Calculate the speed v of the police car at point Y. Determine the distance s between X and Y. Horizontal Calculate the average speed of the police car between X and Y. Show that the instantaneous speed of the car at the midpoint of XY is approximately 18 m s-¹. 11. A light plane must reach a speed of 35 m/s for takeoff. How long is a runway needed if the acceleration is 3.0 m/s²? (assume constant acceleration).

7. A race car accelerates from rest to 55 m s-1 in 5.0 seconds. The acceleration of the car Is m s-² 8. An object's speed increases uniformly from 10.5 km per hour to 99.8 km per hour in 2.41 seconds. Calculate the acceleration in m s-2 and express your answer to three significant figures. 9. The acceleration-time graph of a car is shown below. The initial speed of the car is 5.0 m s-1. # Acceleration (ms) 12 8.0- 4.0- 2.0 4.0 6.0 Time (s) Calculate the velocity of the car at t = 4.0 s. 3 ka 10. A police car, initially at rest at point X, moves with a constant acceleration of 6.2ms on a horizontal road as shown below. It passes through point Y 4.0 s later. Police Calculate the speed v of the police car at point Y. Determine the distance s between X and Y. Horizontal Calculate the average speed of the police car between X and Y. Show that the instantaneous speed of the car at the midpoint of XY is approximately 18 m s-¹. 11. A light plane must reach a speed of 35 m/s for takeoff. How long is a runway needed if the acceleration is 3.0 m/s²? (assume constant acceleration).

College Physics
College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter1: Introduction: The Nature Of Science And Physics
Section: Chapter Questions
Problem 2PE: A car is traveling at a speed of 33 m/s. (a) What is its speed in kilometers per hour? (b) Is it...
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7. A race car accelerates from rest to 55 m s-1 in 5.0 seconds. The acceleration of the car Is m s-² 8. An object's speed increases uniformly from 10.5 km per hour to 99.8 km per hour in 2.41 seconds. Calculate the acceleration in m s-2 and express your answer to three significant figures. 9. The acceleration-time graph of a car is shown below. The initial speed of the car is 5.0 m s-1. # Acceleration (ms) 12 8.0- 4.0- 2.0 4.0 6.0 Time (s) Calculate the velocity of the car at t = 4.0 s. 3
Transcribed Image Text:7. A race car accelerates from rest to 55 m s-1 in 5.0 seconds. The acceleration of the car Is m s-² 8. An object's speed increases uniformly from 10.5 km per hour to 99.8 km per hour in 2.41 seconds. Calculate the acceleration in m s-2 and express your answer to three significant figures. 9. The acceleration-time graph of a car is shown below. The initial speed of the car is 5.0 m s-1. # Acceleration (ms) 12 8.0- 4.0- 2.0 4.0 6.0 Time (s) Calculate the velocity of the car at t = 4.0 s. 3
ka 10. A police car, initially at rest at point X, moves with a constant acceleration of 6.2ms on a horizontal road as shown below. It passes through point Y 4.0 s later. Police Calculate the speed v of the police car at point Y. Determine the distance s between X and Y. Horizontal Calculate the average speed of the police car between X and Y. Show that the instantaneous speed of the car at the midpoint of XY is approximately 18 m s-¹. 11. A light plane must reach a speed of 35 m/s for takeoff. How long is a runway needed if the acceleration is 3.0 m/s²? (assume constant acceleration).
Transcribed Image Text:ka 10. A police car, initially at rest at point X, moves with a constant acceleration of 6.2ms on a horizontal road as shown below. It passes through point Y 4.0 s later. Police Calculate the speed v of the police car at point Y. Determine the distance s between X and Y. Horizontal Calculate the average speed of the police car between X and Y. Show that the instantaneous speed of the car at the midpoint of XY is approximately 18 m s-¹. 11. A light plane must reach a speed of 35 m/s for takeoff. How long is a runway needed if the acceleration is 3.0 m/s²? (assume constant acceleration).
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