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Chapter 2 Extra Review

Chapter 2 Extra Review. 1. An object starts from rest and accelerates at 2.5 m/s 2 for 15 seconds. What is its final velocity?. v = v 0 + at v = 0 + 2.5(15) v = 37.5 m/s.

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Chapter 2 Extra Review

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  1. Chapter 2 Extra Review

  2. 1. An object starts from rest and accelerates at 2.5 m/s2 for 15 seconds. What is its final velocity?

  3. v = v0 + atv = 0 + 2.5(15)v = 37.5 m/s

  4. 2. A car is moving east at 35 m/s. If it accelerates at 20 m/s2 for a period of 22 seconds, what is its final velocity?

  5. v = v0 + atv = 35 + 20(22)v = 475 m/s east

  6. 3. A ball is dropped from the top of a building. How fast is the ball falling after 5 seconds?

  7. v = v0 + gtv = 0 + 10(5)v = 50 m/s

  8. 4. How far does the object in question 1 move over the 15 second period?

  9. x = v0 t + ½ at2x = 0(15) + ½ 2.5(15)2x = 281 m

  10. 5. What is the total displacement of the car in question 2?

  11. x = v0 t + ½ at2x = 35(22) + ½ 20(22)2x = 5610 m east

  12. 6. The ball in question 3 hits the ground after 10 seconds. How tall is the building?

  13. y = v0 t + ½ gt2y = 0(10) + ½ 10(10)2y = 500 m

  14. 7. A bottle rocket is launched horizontally and accelerates at 21 m/s2. What is its velocity when it is 300 meters from its launch point?

  15. v2 = v02 + 2axv2 = 02 + 2(21)300v2 = 12600v = 112 m/s

  16. 8. A base jumper falls until he reaches a speed of 200 m/s. How far must he fall to reach that speed?

  17. v2 = v02 + 2gy2002 = 02 + 2(10)yy = 2000 m

  18. 9. A rock is thrown upward at a velocity of 100 m/s. How high does the rock ascend?

  19. v2 = v02 + 2gy02 = 1002 + 2(-10)yy = 500 m

  20. 10. How long does it take the rock in question 9 to reach its peak height?

  21. v = v0 + at0 = 100 + (-10)tt = 10 s

  22. 11. How long is the rock in questions 9 and 10 in the air?

  23. The amount of time it takes to fall from the peak is the same as the time to reach the peak, so: 10 s X 2 = 20 s.

  24. 12. A car is moving 200 m/s. The driver hits the brakes and the car slows to a stop in 5 seconds. What is the acceleration?

  25. v = v0 + at0 = 200 + a(5)a = -40 m/s2

  26. 13. How far does the car in question 12 travel while slowing to a stop?

  27. x = v0 t + ½ at2x = 200(5) + ½ -40(5)2 x = 500 m

  28. ORv2 = v02 + 2ax02 = 2002 + 2(-40)xx = 500 m

  29. 14. A ball rolls down a ramp with uniform acceleration. It travels 20 meters in 4 seconds. What is the acceleration?

  30. x = v0 t + ½ at220 = 0(4) + ½ a(4)2a = 2.5 m/s2

  31. 15. A dog accelerates from a 2 m/s stroll to a 20 m/s run in 2 seconds. What is the acceleration?

  32. v = v0 + at20 = 2 + a(2)a = 9 m/s2

  33. 16. How far does the dog in question 15 travel during the acceleration?

  34. x = v0 t + ½ at2x = 2(2) + ½ 9(2)2 x = 22 m

  35. ORv2 = v02 + 2ax202 = 22 + 2(9)x x = 22 m

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