1. Marissa’s auto accelerates uniformly at a rate of +2. 60 m/s2. How long does it take for Marissa’s auto to speed up from a velocity of 24. 6 m/s to a velocity of 26. 8 m/s? 2. A bowling ball with a negative initial speed slows down as it rolls down the lane toward the pins. Is the bowling ball’s acceleration positive or negative as it rolls toward the pins? 3. Nathan accelerates his skateboard uniformly along a consecutive way from remainder to 12. 5 m/s in 2. 5 s. a. What is Nathan’s acceleration? B. What is Nathan’s supplanting during this clip interval? c. What is Nathan’s mean speed during this clip interval? 4. Critical Thinking Two autos are traveling in the same way in parallel lanes along a main road. At some blink of an eye. the instantaneous speed of auto A exceeds the instantaneous speed of auto B. Does this mean that auto A’s acceleration is greater than auto B’s? Explain. and use illustrations. 5. Interpreting Graphics The velocity-versus-time graph for a shuttle coach traveling along a consecutive way is shown in Figure 13. a. Identify the clip intervals during which the speed of the shuttle coach 8. 0 is changeless. 7. 0 B. Identify the clip intervals during 6. 0 5. 0 which the acceleration of the shuttle 4. 0 3. 0 coach is changeless. 2. 0 1. 0 c. Find the value for the mean veloc0 ?1. 0 100 200 300 400 500 600 ity of the shuttle coach during each ?2. 0 clip interval identified in B. ?3. 0 ?4. 0 d. Find the acceleration of the shuttle ?5. 0 ?6. 0 coach during each clip interval identi?7. 0 ?8. 0 fied in B. Time ( s ) e. Identify the times at which the speed of the shuttle coach is zero. Figure 13 f. Identify the times at which the acceleration of the shuttle coach is zero. g. Explain what the incline of the graph reveals about the acceleration in each clip interval. 6. Interpreting Graphics Is the shuttle coach in point 5 ever traveling in the same way? Explain. and mention to the clip intervals shown on the graph. Velocity ( m/s )

Section reappraisal replies

1. 0. 85 s 2. positive 3. a. +5. 0 m/s2 B. +16 m c. +6. 4 m/s 4. No. auto A’s acceleration is non needfully greater than auto B’s acceleration ; If the two autos are traveling in the positive way. auto A could be decelerating down ( negative acceleration ) while auto B is rushing up ( positive acceleration ) .
even though auto A’s speed is greater than auto B’s speed. 5. a. 0 s to 30 s ; 60 s to 125 s ; 210 s to 275 s B. 0 s to 30 s ; 30 s to 60 s ; 60 s to 125 s ; 125 s to 210 s ; 210 s to 275 s ; 275 s to 300 s ; 300 s to 520 s ; 520 s to 580 s c. 0 m/s ; 1. 5 m/s ; 0 m/s ; 1. 5 m/s ; 0 m/s ; ?0. 75 m/s ; ?3. 25 m/s ; ?4. 5 m/s d. 0 m/s2 ; 0. 1 m/s2 ; 0 m/s2 ; ?0. 04 m/s2 ; 0 m/s2 ; ?0. 06 m/s2 ; ?0. 02 m/s2 ; 0. 02 m/s2 e. 0 to 30 s ; 210 to 275 s f. 0 s to 30s ; 60 s to 125 s ; 210 s to 275 s g. When the graph slopes upward. acceleration is positive. When it slopes downward. acceleration is negative. 6. No ; The coach is traveling in the positive way from 30 s to 210 s ( when speed is positive ) and in the negative way from 275 s to 600 s ( when speed is negative ) .

Gesture in One Dimension