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Physical Science, 5/e
Bill Tillery, Arizona State University
Motion

Exercises

  1. What is the average speed, in km/hr for a car that travels 22 km in exactly 15 min?Answer
  2. Suppose a radio signal travels from earth and through space at a speed of 3.0 3 108 m/s. How far into space did the signal travel during the first 20.0 minutes?Answer
  3. How far away was a lightning strike if thunder is heard 5.00 seconds after seeing the flash?Answer Assume that sound traveled at 350.0 m/s during the storm.
  4. A car is driven at an average speed of 100.0 km/hr for two hours, then at an average speed of 50.0 km/hr for the next hour. What was the average speed for the three-hour trip?Answer
  5. What is the acceleration of a car that moves from rest to 15.0 m/s in 10.0 s?Answer
  6. How long will be required for a car to go from a speed of 20.0 m/s to a speed of 25.0 m/s if the acceleration is 3.0 m/s2?Answer
  7. A car moving at 80.0 km/hr is brought to a stop in 5.00 seconds. How far did the car travel while stopping?Answer
  8. What is the average speed of a truck that makes a 285 mile trip in 5.0 hours?Answer
  9. A sprinter runs the 200.0 m dash in 21.4 s. (a) What was the sprinter's speed in m/s?Answer (b) If the sprinter were able to maintain this pace, how much time (in hours) would be needed to run the 420.0 km from St. Louis to Chicago?Answer
  10. What average speed must you maintain to make (a) a 400.0 mile trip in 8.00 hours?Answer (b) the same 400.0 mile trip in 7.00 hours?Answer
  11. A bullet leaves a rifle with a speed of 2,360 ft/s. How much time elapses before it strikes a target 1 mile (5,280 ft) away?Answer
  12. A pitcher throws a ball at 40.0 m/s, and the ball is electronically timed to arrive at home plate 0.4625 s later. What is the distance from the pitcher to the home plate?Answer
  13. The Sun is 1.50 3 108 km from Earth, and the speed of light is 3.00 3 108 m/s. How many minutes elapse as light travels from the Sun to Earth?Answer
  14. An archer shoots an arrow straight up with an initial velocity magnitude of 100.0 m/s. After 5.00 s, the velocity is 51.0 m/s. At what rate is the arrow decelerated?Answer
  15. An airplane starts from rest and accelerates for 5.0 s to 235 ft/s before taking off. What is the acceleration of the plane?Answer
  16. A racing car accelerates from 145 ft/s to 220 ft/s in 11 s. What is the acceleration?Answer
  17. What is the velocity of a car that accelerates from rest at 9.0 ft/s2 for 8.0 s?Answer
  18. A sports car moving at 88.0 ft/s is able to stop in 100.0 feet. (a) How much time (in seconds) was required for the stop?Answer (b) What was the deceleration in g's?Answer
  19. A ball thrown straight up climbs for 3.0 s before falling. Neglecting air resistance, with what velocity was the ball thrown?Answer
  20. A ball dropped from a building falls for 4.00 seconds before it hits the ground. (a) What was its final velocity just as it hit the ground?Answer (b) What was the average velocity during the fall?Answer (c) How high was the building?Answer
  21. You drop a rock from a cliff, and 5.00 seconds later you see it hit the ground. How high is the cliff?Answer
  22. How long must a car accelerate at 4.00 m/s2 to go from 10.0 m/s to 50.0 m/s?Answer
  23. What is the velocity of a rock in free fall 3.0 s after it is released from rest?Answer








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