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5.A race car's forward velocity increases from 4.0 m/s to 36 m/s over a 4.0-s time interval. What is its average acceleration? 6. The race car in the previous problem slows from 36 m/s to 15 m/s over 3.0 s. What is its average acceleration? 9. Rohith has been jogging east toward the bus stop at 3.5 m/s when he looks at his watch a sees that he has plenty of time before the bus arrives. Over the next 10.0 s, he slows his par to a leisurely 0.75 m/s. What was his average acceleration during this 10.0 s? 16. A golf ball rolls up a hill toward a miniature-golf hole. Assume 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. 17. A bus traveling 30.0 km/h east has a constant increase in speed of 1.5 m/S-. What is its velocity 6.8 s later? 18. If a car accelerates from rest at a constant rate o 5.5 m/s? north, how long will it take for the carto reach a velocity of 28 m/s north? PRACTICE Problems ADDITIONAL PRACTICE 6.0 20. The graph in Figure 13 describes the motion of two bicyclists, Akiko and Brian, who start from rest and travel north, increasing their speed with a y (m/s) constant acceleration. What was the total displacement of each bicyclist during the time shown for each? Hint: Use the area of a triangle: area = (2 )(base)(height). 2.0 21. The motion of two people, Carlos and Diana, moving south along a 0.0 straight path is described by the graph in Figure 14. What is the total 1.0 2.0 3.0 4.0 displacement of each person during the first 4.0-s interval shown on the Time (s) graph? Figure 13 22. CHALLENGE A car, just pulling onto a straight stretch of highway, has a constant acceleration from 0 m/s to 25 m/s west in 12 s. 3.0 a. Draw a v-t graph of the car's motion. c 2.0 b. Use the graph to determine the car's displacement during the 12.0-s Velocity (m/s) time interval. 1.0 . Another car is traveling along the same stretch of highway. It travels the same distance in the same time as the first car, but its velocity is 0.0 constant. Draw a v-t graph for this car's motion. 1.0 2.0 3.0 4.0 5.0 d. Explain how you knew this car's velocity. Time (s) Figure 14