CHAPTER 2 Motion in One Dimension CUNCEPTUALGUESTIUN S. A ball is thrown vertically upward. (a) What are its velocity and acceleration when it reaches its maximum altitude? (b) What is the acceleration of the ball just before it hits the ground? PROBLEMS 8. A tennis player moves in a x [ml straightline path as shown 4 in Figure P28. Find her average velocity in the Lime intervals from (a) 0 to 1 5 1.0 s. (b) 0 to 4.0 s. (c) 1.0 5 to 5.0 s. and (d) 0 to 5.0 s. i (s: Figure P23 lel_ A speedboat increases its speed uniformly from \"a = 20.0 m/s to v! = 30.0 rn/s in a distance of 2.00 X 103 m. (3) Draw a coordinate system for this situation and label the relevant quantities. including vectors. (b) For the given information. what single equation is most appropriate for nding the acceleration? (c) Solve the equation selected in part {b} symbolicallyr for the boat's acceleration in terms of v]. \"r and Ax. (d) Substi- tute given values, obtaining that acceleration. (e; Find the time it takes the boat to travel the given distance. A car starts from rest and travels for 5.0 s with a uni- form acceleration of 71.5 m/si. The driver then applies the brakes, causing a uniform acceleration of '21} mfsg. If the brakes are applied for 3.0 s. (a) how fast is the car going at the end of the braking period, and (b) how far has the car gene? A model rocket is launched straight upward with an initial speed of 50.0 m/s. It accelerates with a constant upward acceleration of 2.00 I'll/52 until its engines stop at an altitude of [50 m. (a) What can you say about the motion of the rocket after its engines stop? {b} What is the maximum height reached by the rocket? [c] How long after liftoff does the rocket reach iLS maximum height? (d) How long is the rocket in the air