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Tham khảo tài liệu 'physics_test_bank_split_2', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com 45. An object is thrown vertically upward at 35 m s. Taking g 10 m s2 the velocity of the object 5 s later is A. 7.0 m s up B. 15 m s down C. 15 m s up D. 85 m s down E. 85 m s up ans B 46. A feather initially at rest is released in a vacuum 12 m above the surface of the earth. Which of the following statements is correct A. The maximum velocity of the feather is 9.8 m s B. The acceleration of the feather decreases until terminal velocity is reached C. The acceleration of the feather remains constant during the fall D. The acceleration of the feather increases during the fall E. The acceleration of the feather is zero ans C 47. An object is released from rest. How far does it fall during the second second of its fall A. 4.9 m B. 9.8m C. 15 m D. 20m E. 25 m ans C 48. A heavy ball falls freely starting from rest. Between the third and fourth second of time it travels a distance of A. 4.9 m B. 9.8 m C. 29.4 m D. 34.3 m E. 39.8 m ans D 49. As a rocket is accelerating vertically upward at 9.8 m s2 near Earth s surface it releases a projectile. Immediately after release the acceleration in m s2 of the pro jectile is A. 9.8 down B. 0 C. 9.8 up D. 19.6 up E. none of the above ans A 16 Chapter 2 MOTION ALONG A STRAIGHT LINE Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com 50. A stone is released from a balloon that is descending at a constant speed of 10 m s. Neglecting air resistance after 20 s the speed of the stone is A. 2160 m s B. 1760 m s C. 206 m s D. 196 m s E. 186 m s ans C 51. An object dropped from the window of a tall building hits the ground in 12.0 s. If its acceleration is 9.80 m s2 the height of the window above the ground is A. 29.4 m B. 58.8 m C. 118 m D. 353 m E. 706 m ans E 52. Neglecting the effect of air resistance a stone dropped off a 175-m high building lands on the ground in A. 3 s B. 4 s C. 6 s D. 18 s E. 36 s ans C 53. A stone is thrown vertically upward