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Review Questions: Ch 2

Review Questions: Ch 2. A car starts from rest after 9 seconds is it moving at 81 m/s. What is the car’s acceleration? 81/9 = 9 m/s 2. A car travels 8 meters in the first second, 8 meters in the second second, and 8 meters again during the thrid second. The acceleration is? 0 m/s 2.

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Review Questions: Ch 2

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  1. Review Questions: Ch 2 • A car starts from rest after 9 seconds is it moving at 81 m/s. What is the car’s acceleration? • 81/9 = 9 m/s2

  2. A car travels 8 meters in the first second, 8 meters in the second second, and 8 meters again during the thrid second. The acceleration is? • 0 m/s2

  3. If a projectile is fired straight up at 60 m/s, the total time to return to its starting point is? • 12 seconds

  4. Suppose a car is moving in a straight line and steadily increases its speed. It moves from 50 km/h to 55 km/hr in the first second and 55 km/hr to 60 km/hr in the second second. What’s the car’s acceleration? • 5 km/h/s

  5. A car accelerates at 4 m/s2. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 40 m/s? • 10 s

  6. Suppose you take a trip that covers 320 km and it takes you 4 hours to make. What is your average speed? • 80 km/h

  7. p. 26 # 26 • Calculate the avg. speed of a cheetah that runs 140 meters in 5 seconds? • 28 m/s

  8. p. 26 # 27 • Calculate the average speed of Charlie who runs to the store 4 km away in 30 minutes. • 8 km/h

  9. #28 • Calculate the acceleration of a car that can go from rest to 100 km/h in 10 s • 10 km/h/s

  10. #29 • Calculate the instantaneous speed at the 10-second mark for a car that accelerates at 2 m/s2 from a position of rest. • 20m/s

  11. #30 • Calculate the speed of a skateboarder who accelerates from rest for 3 seconds down a ramp at an acceleration of 5 m/s2 • 15 m/s

  12. #31 • Calculate the instantaneous speed of an apple that falls freely from rest position and accelerates at 10 m/s2 for 1.5 seconds • 15 m/s

  13. #32 • An object is dropped from rest and falls freely. After 6 seconds, calculate its instantaneous speed, average speed, and distance fallen. • Instantaneous speed=60 m/s • Avg. speed = • 0m/s + 60 m/s divided by 2 ---> 30 m/s • Distance fallen =(1/2)gt2 • 5 (36) = 180m

  14. Calculate the instantaneous speed and distance fallen for an object that falls freely from rest for 8 seconds • Avg. speed = 80 m/s • Dist. Fallen = 5 (64) • 320 m

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