12. An object is released from rest and falls in the absence of air resistance.
ID: 1487538 • Letter: 1
Question
12. An object is released from rest and falls in the absence of air resistance. Which of the following is true about its motion? A. Its acceleration is zero B. Its acceleration is constant C. Its velocity is constant D. Its acceleration is increasing E. Its velocity is decreasing 4V 13. A ball is thrown straight up from point A it reaches a maximunm height at point B and falls back to point C. Which of the following is true about the direction the ball's velocity and acceleration between A and B? A. B. C. D. E. 14. A package is dropped from an air balloon two times. In the first trial the distance between the balloon and the surface is H and in the second trial 4H. Compare the time it takes for the package to reach the surface in the second trial to that in the first trial? A. The time in the second trial is four times greater B. The time in the second trial is two times greater C. The time the same in both trials because it doesn't depend on height D. The time in the second trial is four times less E. The time in the second trial is two times less 15. Two baseballs are thrown from the roof of a house with the same initial speed one is thrown up, and the other is down. Compare the speeds of the baseballs just before they hit the ground. A. The one thrown up moves faster because the initial velocity is up B. The one thrown down moves faster because the initial velocity is down C. They both move with the same speed down D. The one thrown up moves faster because it has greater acceleration E. The one thrown down moves faster because it has greater accelerationExplanation / Answer
Q12. b it is due to gravity g
Q13. b acceleration is always downward
Q14. b because distance= 1/2 x acceleration x time^2
Q15. b because vf= vi + gt whereas vi is -ve in 1st case and +ve in 2nd case
q16. d because h= v^2/2g
q17. d distance travelled = area under the graph
q18. d constant velocity means zero acceleration and for zero acceleration net force has to be zero
q19. b then only due to inertia it will move backward
q20.c same as q18
q21. a same as q19
q22. a acceleration =3F/6m =1/2 x F/m but we know F/m=a
q23. c
q24. b
q25. b
q26. c
q27. b
q28 a
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