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18. A golf ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hole is positive. a. If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s?, what is its velocity after 2.0 s? b. What is the golf ball's velocity if the constant acceleration continues for 6.0 s? c. Describe the motion of the golf ball in words and with a motion diagram.

18. A golf ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hole is positive. a. If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s?, what is its velocity after 2.0 s? b. What is the golf ball's velocity if the constant acceleration continues for 6.0 s? c. Describe the motion of the golf ball in words and with a motion diagram.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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#18 and #20 please do, thanks!
to solve prob tion. endixe 3.2 Motion with Constant Acceleration ou have learned that the definition of average velocity can be alge- I braically rearranged to show the new position after a period of time, given the initial position and the average velocity. The definition of average acceleration can be manipulated similarly to show the new velocity after a period of time, given the initial velocity and the average acceleration. -Objectives Interpret position-time graphs for motion with constant acceleration Velocity with Average Acceleration If you know an object's average acceleration during a time interval, you can use it to determine how much the velocity changed during that time. The definition of average acceleration, Determine mathematical relationships among position velocity, acceleration. and time Apply graphical and mathematical relationships to solve problems related to a- A, can be rewritten as follows: constant acceleration. v - v, = āAt The equation for final velocity with average acceleration can be written as follows. re Final Velocity with Average Acceleration v= v, + āAt The final velocity is equal to the initial velocity plus the product of the average acceleration and time interval. In cases in which the acceleration is constant, the average acceleration, a. is the same as the instantaneous acceleration, a. This equation can be rearranged to find the time at which an object with constant acceleration has a given velocity. It also can be used to calculate the initial velocity of an object when both the velocity and the time at which it occurred are given. • Additional Problems, Appendix B • Solutions to Selected Problems, Appendix C PRACTICE Problems 18. A golf ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hole is positive. a. If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s? what is its velocity after 2.0 s? b. What is the golf ball's velocity if the constant acceleration continues for 6.0 s? c. Describe the motion of the golf ball in words and with a motion diagram. 19. A bus that is traveling at 30.0 km/h speeds up at a constant rate of 3.5 m/s?. What velocity does it reach 6.8 s later? 20. If a car accelerates from rest at a constant 5.5 m/s?, how long will it take for the car to reach a velocity of 28 m/s? 21. A car slows from 22 m/s to 3.0 m/s at a constant rate of 2.1 m/s. How many seconds are required before the car is traveling at 3.0 m/s? 65 Section 3.2 Motion with Constant Acceleration
Transcribed Image Text:to solve prob tion. endixe 3.2 Motion with Constant Acceleration ou have learned that the definition of average velocity can be alge- I braically rearranged to show the new position after a period of time, given the initial position and the average velocity. The definition of average acceleration can be manipulated similarly to show the new velocity after a period of time, given the initial velocity and the average acceleration. -Objectives Interpret position-time graphs for motion with constant acceleration Velocity with Average Acceleration If you know an object's average acceleration during a time interval, you can use it to determine how much the velocity changed during that time. The definition of average acceleration, Determine mathematical relationships among position velocity, acceleration. and time Apply graphical and mathematical relationships to solve problems related to a- A, can be rewritten as follows: constant acceleration. v - v, = āAt The equation for final velocity with average acceleration can be written as follows. re Final Velocity with Average Acceleration v= v, + āAt The final velocity is equal to the initial velocity plus the product of the average acceleration and time interval. In cases in which the acceleration is constant, the average acceleration, a. is the same as the instantaneous acceleration, a. This equation can be rearranged to find the time at which an object with constant acceleration has a given velocity. It also can be used to calculate the initial velocity of an object when both the velocity and the time at which it occurred are given. • Additional Problems, Appendix B • Solutions to Selected Problems, Appendix C PRACTICE Problems 18. A golf ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hole is positive. a. If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s? what is its velocity after 2.0 s? b. What is the golf ball's velocity if the constant acceleration continues for 6.0 s? c. Describe the motion of the golf ball in words and with a motion diagram. 19. A bus that is traveling at 30.0 km/h speeds up at a constant rate of 3.5 m/s?. What velocity does it reach 6.8 s later? 20. If a car accelerates from rest at a constant 5.5 m/s?, how long will it take for the car to reach a velocity of 28 m/s? 21. A car slows from 22 m/s to 3.0 m/s at a constant rate of 2.1 m/s. How many seconds are required before the car is traveling at 3.0 m/s? 65 Section 3.2 Motion with Constant Acceleration
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