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21, 22 and 23 Speed and Velocity 1. (I) If you are driving 95 km/h along a straight road and you look to the side for 2.0 5, how far do you travel during this inattentive period? 3. (I) A particle at t1 = 2.0 sis at x1 = 4.8 cm and at t; = 4.5 sis at x; = 8.5 cm. What is its average velocity over this time interval? Can you calculate its average speed from these data? Why or why not? 5. (I) A bird can fly 25 km/h. How long does it take to fly 3.5 km? 7. (ll) You are driving home from school steadily at 95 km/h for 180 km. It then begins to rain and you slow to 65 km/h. You arrive home after driving 4.5 h. (a) How far is your hometown from school? (b) What was your average speed? 9. (II) A person jogs eight complete laps around a 400-m track in a total time of 14.5 min. Calculate (a) the average speed and (b) the average velocity, in m/s. 11. (II) A car traveling 95 km/h is 210 m behind a truck traveling 75 km/h. How long will it take the car to reach the truck? 13. (ll) Two locomotives approach each other on parallel tracks. Each has a speed of 155 km/h with respect to the ground. If they are initially 8.5 km apart, how long will it be before they reach each other? (See Fig. 235.) 15. (III) A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.80 s after the ball is released from his hands. What is the speed of the ball, assuming the speed of sound is 340 m/s? 24 Acceleration 17. (I) A sports car accelerates from rest to 95 km/h in 4.3 5. What is its average acceleration in m/sz? 19. (II) A sports car moving at constant velocity travels 120 m in 5.0 5. If it then brakes and comes to a stop in 4.0 5, what is the magnitude of its acceleration (assumed constant) in m/sz, and in 9's (9 = 9.80 m/sz)? 21. (II) A car moving in a straight line starts at x = 0 at t = 0. It passes the point x = 25.0 m with a speed of 11.0 m/s at t = 3.00 s. It passes the point x = 385 m with a speed of 45.0 m/s at t = 20.0 5. Find (a) the average velocity, and (b) the average acceleration, between t = 3.00 s and t = 20.0 s