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Lesson 1.2: Assignment Questions 25 and 2-6 Motion at Constant Acceleration 23. 25. 27. 29. 31. 33. 35. (I) A car accelerates from 14 m/s to 21 m/s in 6.0 5. What was its acceleration? How far did it travel in this time? Assume constant acceleration (II) A baseball pitcher throws a baseball with a speed of 43 m/s. Estimate the average acceleration of the ball during the throwing motion. In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released (Fig. 237). (II) A car slows down uniformly from a speed of 28.0 m/s to rest in 8.00 5. How far did it travel in that time? (II) A car traveling at 95 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.80 m. What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "9's," where 1.00 g = 9.80 m/sz. (II) Determine the stopping distances for an automobile going a constant initial speed of 95 km/h and human reaction time of 0.40 s: (a) for an acceleration a = 3.0 m/sz; (b) for a = 6.0 m/sz. (II) A 75-m-long train begins uniform acceleration from rest. The front of the train has a speed of 18 m/s when it passes a railway worker who is standing 180 m from where the front of the train started. What will be the speed of the last car as it passes the worker? (See Fig. 238.) (II) A runner hopes to complete the 10,000m run in less than 30.0 min. After running at constant speed for exactly 27.0 min, there are still 1200 m to go. The runner must then accelerate at 0.20 m/s2 for how many seconds in order to achieve the desired time