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Unformatted text preview: Lecture 2 Homework Problems P1. What must be your car's average speed in order to travel 235 km in 3.25 h? Solution: km h km/h P5. A rolling ball moves from cm to cm during the time from s to s. What is its average velocity? Solution: m/s P9. A person jogs eight complete laps around a quarter-mile track in a total time of 12.5 min. Calculate (a) the average speed and (b) the average velocity, in m/s Solution: mi km m m 12.5 min s s 400 m s m/s m s m/s P11. Two locomotives approach each other on parallel tracks. Each has a speed of 95 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? Solution: 95 km/h m/s m s 8.5 km m m Each locomotive clears distance 26.39 m/s The distance between the locomotives decreases s min min P17. A sprinter accelerates from rest to 10.0 m/s in 1.35 s. What is her acceleration (a) in m/s , and (b) in km/h Solution: m/s m/s s m/s m s km h km/h km/h P19. A sports car moving at constant speed travels 110 m in 5.0 s. If it then brakes and comes to a stop in 4.0 s, what is its acceleration in m/s ? Express the answer in terms of "g's", where 1.00g m/s Solution: m/s s m/s...
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- Spring '08